diff --git a/ChineseHotEnd.scad b/ChineseHotEnd.scad
new file mode 100644
index 0000000..adcdb5f
--- /dev/null
+++ b/ChineseHotEnd.scad
@@ -0,0 +1,29 @@
+module grooveRing(spread) {
+radGroove = 12.1/2;
+widthGroove = 4.5;
+  #difference() {
+    cylinder(h=widthGroove+1.6*spread+1*0,r=10,$fn=24);
+    translate([0,0,-.1]) cylinder(h=6,r=radGroove+spread*0.6,$fn=32);
+  }
+}
+
+module ChineseHotEnd() {
+spread = 0.2*0;
+radCyl = 16.12/2;
+widthCap = 5.1;
+heightNut = 8.5;
+diamNut = 10;
+radNutEdges = 11.7/2;  // tips of hexagons used for $fn=6 cyl, not face diam
+  difference() {
+    union() {
+      translate([0,0,-widthCap-spread]) {
+        cylinder(h=40+spread,r=radCyl+spread,$fn=48);
+        translate([0,0,-heightNut-.5]) cylinder(h=9.9,r=radNutEdges+1.0*spread,$fn=6);
+      }
+
+    }
+    translate([0,0,spread]) grooveRing(spread);
+  }
+}
+
+ChineseHotEnd();
diff --git a/Makefile b/Makefile
index fdc6d69..c4387da 100644
--- a/Makefile
+++ b/Makefile
@@ -3,6 +3,9 @@ effector.stl retractable.stl power_supply.stl extruder.stl frame_extruder.stl \
 glass_frame.stl m5_internal.stl plate_3x.stl plate_1x.stl \
 switch_holder.stl hotend_fan.stl
 
+aaronGcode:	frame_top.gcode frame_motor.gcode carriage.gcode \
+	extruder.gcode effector.gcode
+
 .SECONDARY:
 
 # Explicit wildcard expansion suppresses errors when no files are found.
@@ -15,7 +18,7 @@ include $(wildcard *.deps)
 	openscad -m make -d $*.deps -o $@ $<
 
 %.gcode: %.stl
-	slic3r -o $@ $<
+	slic3r --load QuelabKosselConfig.ini -o $@ $<
 
 # Replace tabs with spaces.
 %.tab: %.scad
diff --git a/QuelabKosselConfig.ini b/QuelabKosselConfig.ini
new file mode 100644
index 0000000..8aaad28
--- /dev/null
+++ b/QuelabKosselConfig.ini
@@ -0,0 +1,114 @@
+# generated by Slic3r 0.9.10b on Mon Mar 31 08:54:58 2014
+avoid_crossing_perimeters = 0
+bed_size = 195,195
+bed_temperature = 0
+bottom_solid_layers = 3
+bridge_acceleration = 0
+bridge_fan_speed = 100
+bridge_flow_ratio = 1
+bridge_speed = 35
+brim_width = 0
+complete_objects = 0
+cooling = 1
+default_acceleration = 0
+disable_fan_first_layers = 1
+duplicate = 1
+duplicate_distance = 6
+duplicate_grid = 1,1
+end_gcode = G1 X12.0 F4000       ; home (almost) x - stops extruder crashing into frame if at very top of Z height\nG28 Y0       ; move the print to the front.\nM84     ; disable motors\nM104 S0 ; extruder heater off\nM140 S0 ; bed heater off
+external_perimeter_speed = 70%
+external_perimeters_first = 0
+extra_perimeters = 1
+extruder_clearance_height = 20
+extruder_clearance_radius = 20
+extruder_offset = 0x0
+extrusion_axis = E
+extrusion_multiplier = .82
+extrusion_width = 0
+fan_always_on = 0
+fan_below_layer_time = 60
+filament_diameter = 1.75
+fill_angle = 45
+fill_density = 0.4
+fill_pattern = honeycomb
+first_layer_bed_temperature = 0
+first_layer_extrusion_width = 0
+first_layer_height = 0.30
+first_layer_speed = 20%
+first_layer_temperature = 0
+g0 = 0
+gap_fill_speed = 20
+gcode_arcs = 0
+gcode_comments = 0
+gcode_flavor = reprap
+infill_acceleration = 0
+infill_every_layers = 1
+infill_extruder = 1
+infill_extrusion_width = 0
+infill_first = 0
+infill_only_where_needed = 0
+infill_speed = 70
+layer_gcode = 
+layer_height = 0.35
+max_fan_speed = 100
+min_fan_speed = 35
+min_print_speed = 10
+min_skirt_length = 0
+notes = 
+nozzle_diameter = 0.5
+only_retract_when_crossing_perimeters = 0
+output_filename_format = [input_filename_base].gcode
+perimeter_acceleration = 0
+perimeter_extruder = 1
+perimeter_extrusion_width = 0
+perimeter_speed = 60
+perimeters = 3
+post_process = 
+print_center = 97.5,97.5
+raft_layers = 0
+randomize_start = 0
+resolution = 0
+retract_before_travel = 10
+retract_layer_change = 1
+retract_length = 1.2
+retract_length_toolchange = 3
+retract_lift = .05
+retract_restart_extra = 0
+retract_restart_extra_toolchange = 0
+retract_speed = 18
+rotate = 0
+scale = 1
+skirt_distance = 6
+skirt_height = 1
+skirts = 2
+slowdown_below_layer_time = 15
+small_perimeter_speed = 30
+solid_fill_pattern = rectilinear
+solid_infill_below_area = 50
+solid_infill_every_layers = 0
+solid_infill_extrusion_width = 0
+solid_infill_speed = 60
+spiral_vase = 0
+start_gcode = G28 ; home all axes
+support_material = 1
+support_material_angle = 45
+support_material_enforce_layers = 0
+support_material_extruder = 1
+support_material_extrusion_width = 0
+support_material_interface_layers = 0
+support_material_interface_spacing = 0
+support_material_pattern = honeycomb
+support_material_spacing = 1.8
+support_material_speed = 60
+support_material_threshold = 40
+temperature = 0
+threads = 5
+toolchange_gcode = 
+top_infill_extrusion_width = 0
+top_solid_infill_speed = 30
+top_solid_layers = 3
+travel_speed = 135
+use_relative_e_distances = 0
+vibration_limit = 0
+wipe = 0
+z_offset = 0
diff --git a/README.md b/README.md
index 060561f..c64874b 100644
--- a/README.md
+++ b/README.md
@@ -1,13 +1,24 @@
 Release status
 ==============
 
-Most of these parts are now stable and won't change much more.
+These are Mr-What's tweaks to Johann's mini-kossel drawings
+circa Feb. 2014.
+The main changes are:
 
-How to print Mini Kossel
-========================
+   * Attach the carriage to a base that can mount Delrin wheels
+     that ride directly on the extrusion, instead of the
+     linear bearing rails.
 
-* 3x plate_3x.stl (about 3x80g = 240g of plastic)
-* 1x plate_1x.stl (about 50g of plastic)
+   * Added support material to make printing easier on Quelab's
+     public RepRap printer (Hackerspace in Albuquerque, NM)
+
+   * Simplified some parts.
+
+   * Changed effector head to carry a different shaped hot-end.
+
+   * Attempting to use pressure sensors on top of the NEMA-17 motors
+     instead of the probe.  This will require new, very tight tolerance
+     print bed mounts.
 
 Links
 =====
@@ -16,28 +27,13 @@ Links
 * Mailing list: http://groups.google.com/group/deltabot
 * Project history: http://deltabot.tumblr.com
 
-Pay it forward
-==============
-
-Johann is offering free printed parts for Mini Kossel:
-
-* I'm going to make some Mini Kossel printed parts kits.
-* I'm going to give them away for free (as in beer).
-* Some kits may include some non-printed parts.
-* Free international shipping is included.
-* No delivery schedule, maybe only one kit per month.
-
-But there's no such thing as a free lunch. If you want to receive a
-free kit, you must swear by your geek honor:
-
-* To complete your Mini Kossel and tune it well.
-* To print two (2) Mini Kossel kits and also give them away for free.
-* To make your recipients agree to the same rule.
+Upstream Project
+================
 
-After giving away the 2 free kits, you may sell printed parts for any
-price you want.
+Johann offers some free printed parts, on the condition that
+once you get a printer working, you give away two (2) sets
+of free parts to others.  After that, you are free to sell
+printed parts.
 
-If you're interested, please email johann@rocholl.net and let me know
-your favorite PLA color and mailing address. If you want to get your
-printed parts first, explain why you're more qualified than others to
-start giving away high quality printed parts soon.
+See Johann's main source project for more details.
+    https://github.com/jcrocholl/kossel
diff --git a/basePlate.scad b/basePlate.scad
new file mode 100644
index 0000000..d2d2804
--- /dev/null
+++ b/basePlate.scad
@@ -0,0 +1,84 @@
+// complete top (bottom) assembly, fused with vertexB drawing.
+// take a slice of this to generate DXF drawing for laser cut
+
+use <vertexC.scad>;
+
+m3rad = 2.94/2-.1;
+vertexTrad = 181.3;  // radius for vertical extrusion centers
+extTrad    = 109.6;  // radius for horiz extrusion centers
+
+fuzz = -0.1;  // fuzz (contraction) for laser cut holes
+
+slop = 0.3;  // extra fuzz to add for slop in mounts
+
+//projection(cut=true)
+translate([0,0,-0.2]) {
+  difference() {
+    union() {
+      for (a=[0,120,240]) {
+        rotate([0,0,a   ]) translate([0,-vertexTrad,-1]) vertexCframe(5,fuzz+slop,motorHole=true);
+        // dialte a bit to make parts fuse.
+        // initial numbers are close to exact
+        rotate([0,0,a-30]) translate([extTrad-.295,0,5])
+          cube([15+.5,300+1,15],center=true);
+
+        // this should allow us to draw both the motor shaft area,
+        // and have an island drawing the idler holder holes.
+        // delete whichever one(s) you do not want on LaserCut
+        rotate([0,0,a]) translate([0,-vertexTrad+32,-2])
+           hull() for(b=[-1,1]) translate([17*b,0,0])
+              cylinder(r=7,h=9,$fn=48);
+      }
+
+      hull() {
+        for (a=[0,120,240]) rotate([0,0,a])
+           translate([0,-64,-1]) cylinder(h=6,r=85,$fn=6);
+      }
+    }
+
+    // drill more holes in plate
+    translate([0,0,-1]) {
+
+      // drill edge holes -- these can use extra slop
+      for(a=[0,120,240]) rotate([0,0,a]) translate([0,extTrad,-4])
+         for (b=[-140:70:140]) translate([b,0,0]) m3hole(22,fuzz+.15+slop);
+
+      // holes for belt tensioner idler
+      //    should be 22mm in from front of 20mm extrusion
+      // for frogCarriage20v, using openbuilds wheel kit with spacer
+      %translate([0,-vertexTrad+10+11,4]) cube([2*12,22,5],center=true);  // diagnostic for spacing from extrusion
+      for (a=[30,150,270]) rotate([0,0,a])
+         for(b=[-1,1]) translate([vertexTrad-32,12*b,-3])
+            cylinder(r=m3rad+.1,h=27,$fn=11);
+
+      if (1) {
+         // decorative holes
+         translate([0,0,-1]) cylinder(r=35,h=17,$fn=120);
+         for(d=[0,60,120,180,240,300])
+           rotate([0,0,d]) translate([75,0,-1])
+             cylinder(r=30,h=17,$fn=96);
+
+         for(d=[30,150,270]) rotate([0,0,d])
+           translate([118,0,-1])
+             hull() for(a=[-1,1]) translate([0,a*30,0])
+               cylinder(r=12,h=17,$fn=80);
+
+         for(d=[30,90,150,210,270,330]) rotate([0,0,d])
+           translate([90,0,-1]) cylinder(r=8,h=17,$fn=60);
+
+         //for(d=[30,150,270]) for (a=[-1,1]) rotate([0,0,d+a*24])
+         //  translate([118,0,-2]) cylinder(r=8,h=17,$fn=60);
+
+      } else {
+         // a big ring might be better for under print bed
+         //cylinder(r=90,h=18,$fn=120);
+      }
+
+    }
+
+  }
+}
+
+////%translate([-350/2,130,0]) cube([350,20,20]);
+//%translate([0,0,20]) cylinder(r=9*25.4/2,h=4,$fn=180);
+//%translate([0,0,30]) cylinder(r=250/2,h=3.3,$fn=180);
diff --git a/beltCatch.scad b/beltCatch.scad
new file mode 100644
index 0000000..33d5cf7
--- /dev/null
+++ b/beltCatch.scad
@@ -0,0 +1,58 @@
+beltThick  = 1.45 + 0.2;  // thickness of belt from back to tooth tip
+// the doubled belt part must be very tight, or teeth will slip.
+beltThick2 = 2.35 + 0.1;  // thickness of DOUBLED over belt, teeth interlocked
+
+module beltCatch(height,full=false)
+{
+  postRad = 2.7;  // radius of main post
+  // post is a little thin to safely support a screw.
+  // move pilot screw hole to an outer brace
+  //difference() {
+    hull() {
+      cylinder(h=height,r=postRad,$fn=32);
+      translate([-postRad,0,0]) cube([0.6,2.0*postRad,height]);
+    }
+  //  translate([0,0,height-4]) cylinder(h=5,r=.6,$fn=11);  // pilot hole for optional lock-in screw
+  //}
+
+  difference() {
+    union() {
+      difference() {
+        cylinder(h=height,r=postRad+beltThick+3,$fn=48);
+        translate([0,0,-1]) cylinder(h=height+2,r=postRad+beltThick,$fn=48);
+        translate([-10,0,-1]) cube([10,20,height+2]);
+        translate([-10*.7071,10*.7071,-1]) rotate([0,0,-45]) cube([10,20,height+2]);
+      }
+      translate([-postRad-beltThick-3,-.1,0]) hull() {
+        translate([-2, 0,0]) cube([5,3  ,height]);
+        translate([ 1,15,0]) cube([2,1,height]);
+      }
+      hull() {
+        translate([-postRad-beltThick+beltThick2, 2.0*postRad+beltThick+.5,0])
+          cube([2,8.35,height]);
+        rotate([0,0,43]) translate([postRad+beltThick,0,0]) cube([3,1,height]);
+      }
+    }
+
+    // chop off (unnecessary) bottom curve part of catch
+    translate([-12 ,-15,-1]) cube([24,15-postRad-beltThick-0.2,height+2]);
+    translate([-2.5,-15,-1]) cube([ 5,15-postRad-0.2          ,height+2]);
+
+    if (!full) {
+      // chop off most of far brace for close quarters
+      translate([postRad+1,-8,-1]) cube([10,20,height+2]);
+      translate([-2,-7,-1]) rotate([0,0,-45]) cube([5,10,height+2]);
+    }
+
+    // pilot hole for optional lock-in screw
+    translate([1,1.7*postRad+.7*beltThick+3,height-4])
+      cylinder(h=5,r=.8,$fn=6);
+
+  }
+}
+
+union(){
+  beltCatch(6.3);
+  translate([-6.4,-4.5,-2.5]) cube([10.1,20.4,2.7]);
+}
+%translate([0,-20,0]) mirror([0,1,0]) beltCatch(6,full=true);
diff --git a/boxRAMPS200x200.pl b/boxRAMPS200x200.pl
new file mode 100755
index 0000000..489d744
--- /dev/null
+++ b/boxRAMPS200x200.pl
@@ -0,0 +1,79 @@
+#!/usr/bin/perl -w
+# $URL: svn+ssh://mrwhat@ssh.boim.com/home/mrwhat/svn/Walker/trunk/e20payload30_171x285.pl $
+# $Id: e20payload30_171x285.pl 417 2014-04-19 14:38:28Z mrwhat $
+
+require 'laserPartsUtil.pl';
+
+# get this from file name to make SURE it matches
+($wmm,$hmm) = &parseSizeFromFileName($0);
+
+&printLaserCutHeader($wmm,$hmm);
+
+local $x0 = 80;
+local $y0 = 80;
+&ArduinoMegaMountHoles($x0+2,$y0+60);
+
+&startPart($x0,$y0);
+print "M0,0 l10,0
+l0,-3 l10,0 l0,3 l10,0
+l0,-3 l10,0 l0,3 l10,0
+l0,-3 l10,0 l0,3 l10,0
+l0,-3 l10,0 l0,3 l10,0
+l0,-3 l10,0 l0,3 l10,0
+l0,10 l3,0 l0,10 l-3,0
+l0,10 l3,0 l0,15 l-3,0
+l0,10 l3,0 l0,10 l-3,0 l0,10
+l-10,0 l0,3 l-10,0 l0,-3
+l-10,0 l0,3 l-10,0 l0,-3
+l-10,0 l0,3 l-10,0 l0,-3
+l-10,0 l0,3 l-10,0 l0,-3
+l-10,0 l0,3 l-10,0 l0,-3 l-10,0
+l0,-10 l-3,0 l0,-10 l3,0
+l0,-10 l-3,0 l0,-15 l3,0
+l0,-10 l-3,0 l0,-10 l3,0 Z
+$endPart";
+
+print "<desc>Hole to align with reset button</desc>\n";
+&plotCircle(37+$x0,$y0-28,3.5,12);
+
+&startPart($x0-3,$y0);
+print "M3,0 l0,-3 l-13,0
+l0,3 l-10,0 l0,-3 l-10,0
+l0,3 l-10,0 l0,-3 l-10,0
+l0,3 l-10,0 l0,-3 l-13,0
+l0,13 l3,0 l0,10 l-3,0
+l0,10 l3,0 l0,15 l-3,0
+l0,10 l3,0 l0,10 l-3,0
+l0,13
+l13,0 l0,-3 l10,0 l0,3
+l10,0 l0,-3 l10,0 l0,3
+l10,0 l0,-3 l10,0 l0,3
+l13,0 l0,-3 $endPart";
+
+local $px = 16.8-30;
+local $py = 79 + $y0;
+print "<desc>USB port and power holes</desc>
+<g transform='translate($px,$py) rotate(-90)'>
+<g transform='translate(0,90) scale(1,-1)'>
+<path d='M14,19.5 l23.4,0 l0,17 l-23.4,0 Z'/>
+<path d='M66,6 l-14.3,0 l0,13 l14.3,0 Z'/>
+</g></g>\n";
+
+
+&startPart($x0,$y0-3);
+print "M0,0 l0,-10 l-3,0
+l0,-10 l3,0 l0,-10 l-3,0
+l0,-10 l3,0 l0,-10 l-3,0
+l0,-10 l3,0 l0,-13
+l10,0 l0,3 l10,0 l0,-3
+l10,0 l0,3 l10,0 l0,-3
+l10,0 l0,3 l10,0 l0,-3
+l10,0 l0,3 l10,0 l0,-3
+l10,0 l0,3 l10,0 l0,-3
+l10,0 l0,13
+l3,0 l0,10 l-3,0 l0,10
+l3,0 l0,10 l-3,0 l0,10
+l3,0 l0,10 l-3,0 l0,13
+$endPart";
+
+print "</g></svg>\n"; # end of drawing
diff --git a/boxRAMPS400x400.pl b/boxRAMPS400x400.pl
new file mode 100755
index 0000000..39a7400
--- /dev/null
+++ b/boxRAMPS400x400.pl
@@ -0,0 +1,77 @@
+#!/usr/bin/perl -w
+# $URL: svn+ssh://mrwhat@ssh.boim.com/home/mrwhat/svn/Walker/trunk/e20payload30_171x285.pl $
+# $Id: e20payload30_171x285.pl 417 2014-04-19 14:38:28Z mrwhat $
+
+require 'laserPartsUtil.pl';
+
+# get this from file name to make SURE it matches
+($wmm,$hmm) = &parseSizeFromFileName($0);
+
+&printLaserCutHeader($wmm,$hmm);
+
+&ArduinoMegaMountHoles(112,230);
+
+&startPart(110,170);
+print "M0,0 l10,0
+l0,-3 l10,0 l0,3 l10,0
+l0,-3 l10,0 l0,3 l10,0
+l0,-3 l10,0 l0,3 l10,0
+l0,-3 l10,0 l0,3 l10,0
+l0,-3 l10,0 l0,3 l10,0
+l0,10 l3,0 l0,10 l-3,0
+l0,10 l3,0 l0,15 l-3,0
+l0,10 l3,0 l0,10 l-3,0 l0,10
+l-10,0 l0,3 l-10,0 l0,-3
+l-10,0 l0,3 l-10,0 l0,-3
+l-10,0 l0,3 l-10,0 l0,-3
+l-10,0 l0,3 l-10,0 l0,-3
+l-10,0 l0,3 l-10,0 l0,-3 l-10,0
+l0,-10 l-3,0 l0,-10 l3,0
+l0,-10 l-3,0 l0,-15 l3,0
+l0,-10 l-3,0 l0,-10 l3,0 Z
+$endPart";
+
+print "<desc>Hole to align with reset button</desc>\n";
+&plotCircle(147,142,3.5,12);
+
+&startPart(110-3,170);
+print "M3,0 l0,-3 l-13,0
+l0,3 l-10,0 l0,-3 l-10,0
+l0,3 l-10,0 l0,-3 l-10,0
+l0,3 l-10,0 l0,-3 l-13,0
+l0,13 l3,0 l0,10 l-3,0
+l0,10 l3,0 l0,15 l-3,0
+l0,10 l3,0 l0,10 l-3,0
+l0,13
+l13,0 l0,-3 l10,0 l0,3
+l10,0 l0,-3 l10,0 l0,3
+l10,0 l0,-3 l10,0 l0,3
+l13,0 l0,-3 $endPart";
+
+print "<desc>USB port and power holes</desc>
+<g transform='translate(16.8,249) rotate(-90)'>
+<g transform='translate(0,90) scale(1,-1)'>
+<path d='M14,19.5 l23.4,0 l0,17 l-23.4,0 Z'/>
+<path d='M66,6 l-14.3,0 l0,13 l14.3,0 Z'/>
+</g></g>\n";
+
+
+#&startPart(110-3,170-3-5,-90); # for checking alignment with front plate
+&startPart(110,170-3);
+print "M0,0 l0,-10 l-3,0
+l0,-10 l3,0 l0,-10 l-3,0
+l0,-10 l3,0 l0,-10 l-3,0
+l0,-10 l3,0 l0,-13
+l10,0 l0,3 l10,0 l0,-3
+l10,0 l0,3 l10,0 l0,-3
+l10,0 l0,3 l10,0 l0,-3
+l10,0 l0,3 l10,0 l0,-3
+l10,0 l0,3 l10,0 l0,-3
+l10,0 l0,13
+l3,0 l0,10 l-3,0 l0,10
+l3,0 l0,10 l-3,0 l0,10
+l3,0 l0,10 l-3,0 l0,13
+$endPart";
+
+print "</g></svg>\n"; # end of drawing
+
diff --git a/card.stl b/card.stl
deleted file mode 100644
index 0c39cd7..0000000
--- a/card.stl
+++ /dev/null
@@ -1,5966 +0,0 @@
-solid OpenSCAD_Model
-  facet normal -1 -0 -0
-    outer loop
-      vertex -43 -14.5 -0.1
-      vertex -43 -14.5 0.3
-      vertex -43 14.5 -0.1
-    endloop
-  endfacet
-  facet normal -1 0 0
-    outer loop
-      vertex -43 14.5 -0.1
-      vertex -43 -14.5 0.3
-      vertex -43 14.5 0.3
-    endloop
-  endfacet
-  facet normal -0.991445 -0.130526 -0
-    outer loop
-      vertex -43 -14.5 -0.1
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-      vertex -14 -2.4 0.3
-    endloop
-  endfacet
-  facet normal 0.707107 0.707107 -0
-    outer loop
-      vertex -14 3.6 0.3
-      vertex -14 3.6 -0.1
-      vertex -14.1 3.7 0.3
-    endloop
-  endfacet
-  facet normal 0.707107 0.707107 -0
-    outer loop
-      vertex -14.1 3.7 0.3
-      vertex -14 3.6 -0.1
-      vertex -14.1 3.7 -0.1
-    endloop
-  endfacet
-  facet normal 0.514496 0.857493 -0
-    outer loop
-      vertex -14.1 3.7 0.3
-      vertex -14.1 3.7 -0.1
-      vertex -14.225 3.775 0.3
-    endloop
-  endfacet
-  facet normal 0.514496 0.857493 -0
-    outer loop
-      vertex -14.225 3.775 0.3
-      vertex -14.1 3.7 -0.1
-      vertex -14.225 3.775 -0.1
-    endloop
-  endfacet
-  facet normal 0.141421 0.989949 -0
-    outer loop
-      vertex -14.225 3.775 0.3
-      vertex -14.225 3.775 -0.1
-      vertex -14.4 3.8 0.3
-    endloop
-  endfacet
-  facet normal 0.141421 0.989949 -0
-    outer loop
-      vertex -14.4 3.8 0.3
-      vertex -14.225 3.775 -0.1
-      vertex -14.4 3.8 -0.1
-    endloop
-  endfacet
-  facet normal 0 1 0
-    outer loop
-      vertex -14.4 3.8 0.3
-      vertex -14.4 3.8 -0.1
-      vertex -20.2 3.8 0.3
-    endloop
-  endfacet
-  facet normal 0 1 -0
-    outer loop
-      vertex -20.2 3.8 0.3
-      vertex -14.4 3.8 -0.1
-      vertex -20.2 3.8 -0.1
-    endloop
-  endfacet
-  facet normal -0.141421 0.989949 0
-    outer loop
-      vertex -20.2 3.8 0.3
-      vertex -20.2 3.8 -0.1
-      vertex -20.375 3.775 0.3
-    endloop
-  endfacet
-  facet normal -0.141421 0.989949 0
-    outer loop
-      vertex -20.375 3.775 0.3
-      vertex -20.2 3.8 -0.1
-      vertex -20.375 3.775 -0.1
-    endloop
-  endfacet
-  facet normal -0.514496 0.857493 0
-    outer loop
-      vertex -20.375 3.775 0.3
-      vertex -20.375 3.775 -0.1
-      vertex -20.5 3.7 0.3
-    endloop
-  endfacet
-  facet normal -0.514496 0.857493 0
-    outer loop
-      vertex -20.5 3.7 0.3
-      vertex -20.375 3.775 -0.1
-      vertex -20.5 3.7 -0.1
-    endloop
-  endfacet
-  facet normal -0.707107 0.707107 0
-    outer loop
-      vertex -20.5 3.7 0.3
-      vertex -20.5 3.7 -0.1
-      vertex -20.6 3.6 0.3
-    endloop
-  endfacet
-  facet normal -0.707107 0.707107 0
-    outer loop
-      vertex -20.6 3.6 0.3
-      vertex -20.5 3.7 -0.1
-      vertex -20.6 3.6 -0.1
-    endloop
-  endfacet
-endsolid OpenSCAD_Model
diff --git a/carriage.scad b/carriage.scad
index 5feab83..d8d6b3f 100644
--- a/carriage.scad
+++ b/carriage.scad
@@ -50,12 +50,16 @@ module carriage() {
     // Screws for linear slider.
     for (x = [-10, 10]) {
       for (y = [-10, 10]) {
-        translate([x, y, thickness]) #
+        translate([x, y, thickness]) 
           cylinder(r=m3_wide_radius, h=30, center=true, $fn=12);
       }
     }
+
+    // potential screw to hold a washer to keep belts in-place
+    translate([3,-2.5,8]) cylinder(r=1,h=9,$fn=12);
+
     // Screws for ball joints.
-    translate([0, 16, horn_thickness/2]) rotate([0, 90, 0]) #
+    translate([0, 16, horn_thickness/2]) rotate([0, 90, 0]) 
       cylinder(r=m3_wide_radius, h=60, center=true, $fn=12);
     // Lock nuts for ball joints.
     for (x = [-1, 1]) {
@@ -68,4 +72,26 @@ module carriage() {
   }
 }
 
-carriage();
+module earBrace() {
+  intersection () {
+    hull() {
+      rotate([0,55,0]) scale([2,1,1]) cylinder(r=.4,h=7,$nf=12);
+      linear_extrude(height=0.1)
+        polygon(points=[[0,0],[7,1.5],[7,-1.5]], paths=[[0,1,2,0]]);
+    }
+    translate([-2,-5,0]) cube([10,10,10]);
+  }
+}
+
+union() {
+  translate([0,0,.34]) carriage();
+  color("Cyan") {
+    linear_extrude(height=0.4)
+      polygon(points=[[17,-20],[23,16],[17,28],  [-17,28],[-23,16],[-17,-20]],
+              paths=[[0,1,2,3,4,5,0]]);
+
+    // support material, forced
+    translate([ 15,16.2,0]) earBrace();
+    translate([-15,16.2,0]) mirror([1,0,0]) earBrace();
+  } 
+}
diff --git a/carriage.stl b/carriage.stl
deleted file mode 100644
index 39b521c..0000000
Binary files a/carriage.stl and /dev/null differ
diff --git a/cncProbe.scad b/cncProbe.scad
new file mode 100644
index 0000000..1ffb871
--- /dev/null
+++ b/cncProbe.scad
@@ -0,0 +1,184 @@
+// sketch for low-impact surface probe switch
+// Aaron Birenboim   nov14
+
+// low accuracy... but high repeatability version
+// of a CNC probe
+
+magRad=10.5;  // radius of magnet group
+
+sphereDiam = 3.0;  // new set of spheres appears to be true 3.0mm
+//bitDiam = 1.12;  // 3/64" drill bit, for rods
+bitDiam = 1.56;  // 1/16" drill bit
+
+mountTowerRad = 10;
+
+module magnetGroup(fuzz=0) {
+ for(i=[-120,0,120]) rotate([0,0,i])
+   for (a=[-1,1])  translate([1.8*a,-magRad,0])
+     sphere(sphereDiam/2+fuzz,$fn=36);   // 3mm bucky balls
+}
+module magnetGroupBase() {
+ for(i=[-120,0,120]) rotate([0,0,i]) hull()
+   for (a=[-1,1])  translate([1.8*a,-magRad,-1])
+     cylinder(r2=sphereDiam/2+.5,r1=sphereDiam/2+1.1,h=1.35,$fn=36);
+}
+
+module magnetJig(fuzz=0) {
+  difference() {
+    translate([0,0,-3]) triPlate(2.4,2*magRad-2,2*magRad+4.3);
+    magnetGroup(fuzz=fuzz);
+    translate([0,0,-4]) cylinder(r=1.7,h=5,$fn=32);
+
+    // mount towers
+    for(a=[-120,0,120]) rotate([0,0,a]) {
+      translate([0,mountTowerRad  ,-3.6]) cylinder(r=3.5,h=14,$fn=6);
+      //translate([0,mountTowerRad+2,-3.6]) 
+      //  scale([3,1,1]) rotate([0,0,30]) cylinder(r=4.5  ,h=14,$fn=3);
+    }
+  }
+}
+
+// top mounting plate for m6 bolt attachment
+module topPlateM6(fuzz=.1) {
+  difference() {
+    rotate([0,0,60]) triPlate(8,20,30);
+
+    for(a=[-120,0,120]) rotate([0,0,a])
+      translate([0,mountTowerRad,0]) {
+        // mount tower cut-out
+        translate([0,0,5]) cylinder(r=4+fuzz*2,h=8,$fn=6);
+
+        // screw holes for mount towers  #2 screw is diam 2.12
+        translate([0,0,-1]) {
+          cylinder(r=2.12/2+fuzz+.2,h=14,$fn=24); // drill hole
+          cylinder(r1=4.1/2+fuzz+.2,r2=4.1/2+fuzz,h=3,$fn=24); // countersink
+        }
+      }
+
+    // countersink for hex head on M6
+    cylinder(r=5.9/2+fuzz,h=22,$fn=36,center=true);
+    translate([0,0,4]) cylinder(h=6,r1=9.9/2/cos(30)+0.5*fuzz,
+                                    r2=9.9/2/cos(30)+3  *fuzz,$fn=6);
+    translate([0,0,3.3]) cylinder(r=9/2+3*fuzz,h=1,$fn=48);
+    translate([0,0,2]) cylinder(h=3,r1=5.9/2,r2=5.9/2+1,$fn=48);
+
+  }
+}
+module topPlateM6a(fuzz=.1) {
+  difference() {
+    union() {
+      // mount towers
+      for(a=[-120,0,120]) rotate([0,0,a])
+        translate([0,mountTowerRad,0]) cylinder(r=4,h=8,$fn=6);
+
+      rotate([0,0,60]) //difference() {
+        triPlate(6,16.92,26.92);
+      //  translate([0,0,3]) triPlate(4,14,24);
+      //}
+
+      // hex head catcher for M6
+      cylinder(h=6,r1=8,r2=6,$fn=6);
+    }
+
+    // screw holes for mount towers  #2 screw is diam 2.12
+    for(a=[-120,0,120]) rotate([0,0,a])
+       translate([0,mountTowerRad,-1])
+         cylinder(r=2.12/2+fuzz+.2,h=14,$fn=13);
+
+    // countersink for hex head on M6
+    cylinder(r=5.9/2+fuzz,h=22,$fn=17,center=true);
+    translate([0,0,3]) cylinder(h=6,r1=9.9/2/cos(30),r2=9.9/2/cos(30)+2*fuzz,$fn=6);
+    translate([0,0,2.3]) cylinder(r=9/2+3*fuzz,h=1,$fn=48);
+
+  }
+}
+
+module magnetMount(notional=false,fuzz=0) {
+  // magnets for contacts and alignment
+  if (notional) color([0,0.4,0.8]) magnetGroup();
+
+  // magnet base
+  difference() {
+    union() {
+      difference() {
+        translate([0,0,-3.6]) triPlate(3.6+2.6,2*magRad+2,2*magRad+8);
+        translate([0,0,-0.2]) triPlate(10     ,2*magRad-1,2*magRad+5);
+      }
+      magnetGroupBase();
+
+      // mount towers
+      for(a=[-120,0,120]) rotate([0,0,a])
+        translate([0,mountTowerRad,-3.6]) {
+          cylinder(r=4,h=17,$fn=6);
+
+          hull() {
+            translate([0,0 ,14]) cylinder(r=.4,h=1,$fn=6);
+            translate([0,0.8,6]) cube([20,1.3,.1],center=true);
+          }
+        }
+    }
+
+    // screw holes for mount towers  #2 screw is diam 2.12
+    for(a=[-120,0,120]) rotate([0,0,a])
+        translate([0,mountTowerRad,5])
+          #cylinder(r=2.12/2+fuzz-.2,h=14,$fn=9);
+
+    magnetGroup(fuzz=fuzz);
+
+    // skip this for actual printed model... 
+    //   this is just to see insides easier for display
+    if (notional)
+      translate([0,0,.5]) cylinder(r=7+magRad,h=10,$fn=6);
+
+    // probe pass-through
+    translate([0,0,-4]) cylinder(r=1.5,h=5,$fn=32);
+
+    // drill holes for magnet contact wires
+    for(a=[-1,1]) translate([a*5.5,15,.65])
+      rotate([90,0,0]) rotate([0,0,18]) cylinder(r=1,h=6,$fn=5);
+
+  }
+}
+
+module probeMount(notional=false,fuzz=0) {
+  difference() {
+    hull() {
+      cylinder(r=3,h=6,$fn=6);
+
+      // holders for rods
+      for(a=[-120,0,120]) rotate([0,0,a])
+        rotate([90,0,0]) rotate([0,0,22.5])
+        cylinder(r=bitDiam/2+1.5,h=8,$fn=8);
+
+    }
+
+    // chop off bottom of hull a bit
+    translate([0,0,-3]) cylinder(r=22,h=3-bitDiam/2-fuzz-.2,$fn=6);
+
+    // drill holes to hold rods
+    for(a=[-120,0,120]) rotate([0,0,a])
+      #translate([0,-1.5,0] )rotate([90,0,0])
+        cylinder(r=bitDiam/2+fuzz,h=10.5,$fn=16);
+
+    // hole for probe
+    //#cylinder(r=bitDiam/2+fuzz,h=20,$fn=16,center=true);
+    #cylinder(r=.7+fuzz,h=20,$fn=12,center=true); // for pin
+  }
+}
+
+module triPlate(h=2,r1=8,r2=10) {
+  rotate([0,0,30]) intersection() {
+    cylinder(r=r1,h=h,$fn=3);
+    translate([0,0,-0.1]) rotate([0,0,60]) cylinder(r=r2,h=h+0.2,$fn=3);
+  }
+}
+
+// parts to be fabricated
+//translate([35,0,0])
+magnetMount(fuzz=0.16);//,notional=true);
+translate([0,0,1.5]) probeMount(fuzz=0.2);
+%translate([33,0,4]) magnetJig(fuzz=.11);
+
+//translate([0,0,14])
+//%translate([0,0,2.8]) rotate([180,0,60])
+  //topPlateM6();
diff --git a/effector.scad b/effector.scad
index a4d76ef..bc8a4f2 100644
--- a/effector.scad
+++ b/effector.scad
@@ -43,4 +43,25 @@ module effector() {
   }
 }
 
-translate([0, 0, height/2]) effector();
+module supportBlade() {
+  intersection() { 
+    translate([-2,-3,0]) cube([5,6,5]);
+    translate([0,-.2,-1.3]) rotate([0,-38,0]) hull() {
+      cube([3.3,.4,1.5]);
+      translate([0,-.8,-3]) cube([3,2,1]);
+    }
+  }
+}
+
+// Shift up and add a brim for easier printing at quelab
+union() {
+translate([0, 0, height/2+.32]) effector();
+color("Cyan") {
+  cylinder(h=.4,r1=34.3,r2=34,$fn=6);
+  for (a = [0,120,240]) {
+    rotate([0,0,a]) {
+      translate([ 18.4,-20,0.1]) supportBlade();
+      translate([-18.4,-20,0.1]) rotate([0,0,180]) supportBlade();
+    }
+  }
+}}
\ No newline at end of file
diff --git a/effector.stl b/effector.stl
deleted file mode 100644
index 11654c4..0000000
Binary files a/effector.stl and /dev/null differ
diff --git a/effectorC.scad b/effectorC.scad
new file mode 100644
index 0000000..1597de3
--- /dev/null
+++ b/effectorC.scad
@@ -0,0 +1,124 @@
+include <configuration.scad>;
+use <ChineseHotEnd.scad>;  // as altered for chinese J hot-end
+
+//metric_thread(diameter=5, pitch=0.8, length=8, internal=true);
+
+separation = 40;  // Distance between ball joint mounting faces.
+offset = 20;  // Same as DELTA_EFFECTOR_OFFSET in Marlin.
+mount_radius = 12.5;  // Hotend mounting screws, standard would be 25mm.
+hotend_radius = 8;  // Hole for the hotend (J-Head diameter is 16mm).
+push_fit_height = 4;  // Length of brass threaded into printed plastic.
+height = 8;
+cone_r1 = 2.5;
+cone_r2 = 14;
+
+module effector() {
+  difference() {
+    union() {
+      cylinder(r=offset-3, h=height, center=true, $fn=60);
+      for (a = [60:120:359]) rotate([0, 0, a]) {
+	     rotate([0, 0, 30]) translate([offset-2, 0, 0])
+	     cube([10, 13, height], center=true);
+	     for (s = [-1, 1]) scale([s, 1, 1]) {
+	       translate([0, offset, 0]) difference() {
+	         intersection() {
+	           cube([separation, 40, height], center=true);
+	           translate([0, -4, 0]) rotate([0, 90, 0])
+		        cylinder(r=10, h=separation, center=true);
+	           translate([separation/2-7, 0, 0]) rotate([0, 90, 0])
+		        cylinder(r1=cone_r2, r2=cone_r1, h=14, center=true, $fn=24);
+	         }
+	       rotate([0, 90, 0])
+	         cylinder(r=m3_radius, h=separation+1, center=true, $fn=12);
+	       rotate([90, 0, 90])
+	         cylinder(r=m3_nut_radius, h=separation-24, center=true, $fn=6);
+	       }
+        }
+      }
+
+      // extra cap for chinese hot end
+      hull() {
+        cylinder(r=8.5,h=12,$fn=6);
+        cylinder(r=3.6,h=16,$fn=24);
+      }
+    }
+    // for shorter hot-end that Johann used:
+    //translate([0, 0, push_fit_height-height/2]) cylinder(r=hotend_radius, h=height, $fn=36);
+    translate([0,0,-4.1+.3]) mirror([0,0,1]) ChineseHotEnd();
+    translate([0,0,-height/2-.2]) cylinder(h=5.6,r=16.12/2+.2,$fn=48);  // mount depth for hot end is critical.  spread adjustments on ChineseHotEnd may not be perfect.  This adjusts mount depth
+
+    // overkill. 
+    //translate([0, 0, -6+14]) import("m5_internal.stl");
+    translate([0, 0, -6+14]) cylinder(h=11,r=4.9/2-.2,$fn=16);
+
+    for (a = [0:60:359]) rotate([0, 0, a]) {
+      translate([0, mount_radius, 0])
+	     cylinder(r=m3_wide_radius, h=2*height, center=true, $fn=12);
+    }
+
+    // slice in half to check wall thicknesses, diagnostic only
+    //translate([-30,0,-10]) cube([60,30,30]);    
+
+  }
+}
+
+module supportBlade() {
+  intersection() { 
+    translate([-2,-3,0]) cube([5,6,5]);
+    translate([0,-.2,-1.3]) rotate([0,-38,0]) hull() {
+      cube([3.3,.2,1.5]);
+      translate([0,-.8,-3]) cube([3,2,1]);
+    }
+  }
+}
+
+module supportPost(x,y,h,r=1,scalex=1,scaley=1,rot=0,thick=0.2,fn=6) {
+  translate([x,y,0]) rotate([0,0,rot]) scale([scalex,scaley,1]) difference() {
+    cylinder(h=h,r=r,$fn=fn);
+    translate([0,0,-.1]) cylinder(h=h+.2,r=r-thick,$fn=fn);
+  }
+}
+
+module nutCatcher() {
+  difference() {
+    cylinder(h=2.3,r1=4.6,r2=4,$fn=18);
+    // nuts are 5.5mm wide.  radius to corner is 5.5/2/.866=3.1755
+    translate([0,0,-.1]) cylinder(h=2.5,r1=3.08,r2=3.3,$fn=6);
+  }
+}
+
+module boltCatcher() {
+m3headRad=5.36/2;
+  difference() {
+    cylinder(h=2.3,r1=4.5,r2=3.6,$fn=36);
+    translate([0,0,-.1]) cylinder(h=2.5,r1=m3headRad+0.1,r2=m3headRad+0.25,$fn=24);
+  }
+}
+
+use <probePost.scad>;
+
+//difference() {
+  union() {
+    translate([0, 0, height/2]) effector();
+    color("Cyan") {
+      for (a = [0,120,240]) {
+        rotate([0,0,a]) {
+          translate([ 18.4,-20,0]) supportBlade();
+          translate([-18.4,-20,0]) rotate([0,0,180]) supportBlade();
+        }
+      }
+
+      supportPost(0,0,height-2.66,r=6.3);
+      supportPost(0,0,height-2.66,r=7.7);
+      supportPost(0,0,height+6.25,r=4.5);
+      supportPost(0,0,height+6.3 ,r=2.5);
+    }
+
+    // gave up on retractable probe : translate([0,-12.5,height])retractable();
+    for (a=[-30:60:270]) { rotate([0,0,a]) {
+      translate([12.5,0,height-.1]) boltCatcher();
+    }}
+  }
+//  // bore out a larger hole to hold bowden tube for lower-friction probe guide
+//  %translate([0,-12.5,-1]) cylinder(h=21.1,r=3.95/2,$fn=24);
+//}
diff --git a/effectorM.scad b/effectorM.scad
new file mode 100644
index 0000000..f140740
--- /dev/null
+++ b/effectorM.scad
@@ -0,0 +1,122 @@
+include <configuration.scad>;
+use <longAllMetalBowdenHotEnd.scad>;  // as altered for chinese all-metal hot-end
+
+//metric_thread(diameter=5, pitch=0.8, length=8, internal=true);
+
+offset = 20+4;  // Same as DELTA_EFFECTOR_OFFSET in Marlin.
+mount_radius = 18; //12.5;  // Hotend mounting screws, standard would be 25mm.
+hotend_radius = 8;  // Hole for the hotend (J-Head diameter is 16mm).
+push_fit_height = 4;  // Length of brass threaded into printed plastic.
+height = 12;
+
+use <rodMountHorn.scad>;
+
+module rodMountHorns() {
+  for (a = [60:120:359]) rotate([0, 0, a]) translate([0, offset, 0])
+    intersection() {
+	   translate([0, -2, 0]) rotate([0, 90, 0])
+	     cylinder(r=8, h=55, center=true);
+	   rodMountHorn();
+    }
+}
+
+module effector() {
+  difference() {
+    intersection() {
+      cylinder(r=2.5*offset,h=height,center=true,$fn=6);
+
+      union() {
+        cylinder(r=offset+3.7,h=height,center=true,$fn=6);
+        rodMountHorns();
+
+        // more bracing on effector
+        for(a=[90:120:355]) rotate([0,0,a]) translate([19,0,0])
+          rotate([90,0,0]) cylinder(r=height*0.8,h=20,$fn=36,center=true);
+      }
+    }
+
+    // nut cut-out for horns
+    for(a=[60:120:355]) rotate([0,0,a])
+      translate([0,offset,0]) rodMountHornBore();
+
+    // hole for hot-end
+    cylinder(h=height+1,r=16/2+.1,$fn=60,center=true);
+
+    // bolt holes
+    for (a = [30:60:359]) rotate([0, 0, a])
+      translate([0, mount_radius, 0])
+	     cylinder(r=m3_wide_radius, h=height+1, center=true, $fn=12);
+  }
+}
+
+// a fuzz of about .1 to .2 good for 3D printing.
+// -.1 to -.2 for laser cut projection
+module bracePlate(fuzz=.1,hole=6) {
+  difference() {
+    union() {
+      cylinder(r=24,h=4,$fn=60);
+      for (a = [30:60:359]) rotate([0, 0, a])
+        translate([0, mount_radius, 3.9]) nutCatcher();
+    }
+    translate([0,0,2.4]) cylinder(r=8+fuzz,h=6,$fn=60);
+    // top base plate could be as low as 011.1mm and fit around nut
+    // default collar is 012mm
+    translate([0,0,-1]) cylinder(r=hole+fuzz,h=6,$fn=60);
+    for (a = [30:60:359]) rotate([0, 0, a]) {
+      translate([0, mount_radius, 0])
+	     cylinder(r=2.94/2+fuzz, h=9, center=true, $fn=12);
+    }
+  }
+}
+
+module nutCatcher() {
+  difference() {
+    cylinder(h=2.3,r1=4.6,r2=4,$fn=18);
+    // nuts are 5.5mm wide.  radius to corner is 5.5/2/.866=3.1755
+    translate([0,0,-.1]) cylinder(h=2.5,r1=3.08,r2=3.3,$fn=6);
+  }
+}
+
+module boltCatcher() {
+m3headRad=5.36/2;
+  difference() {
+    cylinder(h=2.3,r1=4.5,r2=3.6,$fn=36);
+    translate([0,0,-.1]) cylinder(h=2.5,r1=m3headRad+0.1,r2=m3headRad+0.25,$fn=24);
+  }
+}
+
+/////////////////////////////////////////////////////////////
+
+translate([0,0,-6]) mirror([0,0,1]) %metalHotEnd();
+
+effector();
+
+// pattern for laser-cut top plate
+//projection(cut=true) translate([0,0,-1])
+%translate([0,0,8])
+  bracePlate(fuzz=0,hole=11.1/2);
+
+// split bottom plate into two parts
+/*
+difference() {
+  bracePlate(fuzz=.1,hole=6);
+  for (a=[-6,6]) translate([15,a,0]) cube([30,.2,6],center=true);
+}
+*/
+fz=.2;
+if(0)
+if(0) {
+  difference() {
+    bracePlate(fuzz=.1,hole=6);
+    translate([15,0,4]) cube([30,12+fz,9],center=true);
+    translate([15,0,2.4+3]) cube([30,16+fz,6],center=true);
+  }
+} else {
+  intersection() {
+    bracePlate(fuzz=.1,hole=6);
+    translate([15,0,4]) cube([30,12-fz,9],center=true);
+  }
+}
+
+// other file may use bracePlate and nutCatcher modules
+// to build fan mounts and ducts
diff --git a/endstop.scad b/endstop.scad
index e05bab0..90eaf09 100644
--- a/endstop.scad
+++ b/endstop.scad
@@ -6,7 +6,7 @@ thickness = 9;  // 1mm thicker than linear rail.
 width = 15;  // Same as vertical extrusion.
 height = 15;
 
-module endstop() {
+module endstopForRail() {
   difference() {
     union() {
       cube([width, thickness, height], center=true);
@@ -35,4 +35,44 @@ module endstop() {
   }
 }
 
-translate([0, 0, height/2]) endstop();
\ No newline at end of file
+thick=6;  // less thick for carriage
+// for more recent design of integrated wheeledCarriage
+//           use tilt=11.3 for first iteration with trapazoidal base
+//             slope on original trapazoid bottom carriage was 8mm in 40.
+module endstopCarriage(tilt=0) {
+  difference() {
+    union() {
+      //translate([-width/2-1,-height/2,0]) cube([width+2+5, height+2, thick]);
+      hull() {
+        translate([-4,-6,0])  cylinder(h=thick,r=4,$fn=22);
+        translate([ 4,-6,0])  cylinder(h=thick,r=4,$fn=22);
+        translate([-4, 4,0])  cylinder(h=thick,r=4,$fn=22);
+        translate([ 6, 4,0])  rotate([0,0,tilt]) translate([9.5,0,0])
+                              cylinder(h=thick,r=4,$fn=22);
+      }
+      translate([-3.4/2,-10,3.5]) cube([3.4, height+3, thick]);
+    }
+
+    // bolt hole to attach to extrusion
+    translate([0,-2.5,0]) {
+      translate([0,0,-1]) cylinder(r=m3_wide_radius, h=20, $fn=12);
+      translate([0,0,-1]) cylinder(r=3, h=3.3, $fn=24);
+      translate([0,0,thick+1]) rotate([0,0,30])
+        cylinder(r1=5.8/2,r2=8/2,h=4,$fn=6);
+    }
+
+    translate([3, 4, -1]) {
+      translate([2.5,0,0]) {
+        %rotate([90,0,180+tilt]) scale([-1,1,1]) translate([9.5/2-1,-2,0]) microswitch();
+        // 2.4mm diam was good for M2.5.  go a little smaller for #2
+        rotate([0,0,tilt])
+          #translate([9.5-1,0,-1.5]) cylinder(r=2.3/2, h=thick+4, $fn=12);
+          #translate([   -1,0,-1.5]) cylinder(r=2.3/2, h=thick  , $fn=12);
+      }
+    }
+  }
+}
+
+//translate([0,30, height/2]) endstopForRail();
+mirror([1,0,0])  // switched sides of carriage
+  endstopCarriage(11.3*0);
diff --git a/endstop.stl b/endstop.stl
deleted file mode 100644
index ffd55d1..0000000
Binary files a/endstop.stl and /dev/null differ
diff --git a/endstop20v.scad b/endstop20v.scad
new file mode 100644
index 0000000..a36f8d2
--- /dev/null
+++ b/endstop20v.scad
@@ -0,0 +1,44 @@
+use <microswitch.scad>;
+use <ext20v.scad>;
+
+m5rad = 4.92/2;//4.88/2;
+m5_head_radius = 8.62/2;//8.5/2;  // 5mm head height, uses 4mm hex drive
+
+module microswitchEndstop20v(fuzz) {
+  difference() {
+    hull() {
+      translate([4.6,-4,0]) cylinder(h=10,r=5,$fn=36);
+      translate([ -5,-4,0]) cylinder(h=10,r=5,$fn=36);
+      translate([3.6,10,0]) cylinder(h=10,r=5,$fn=36);
+      translate([-18,10,0]) cylinder(h=10,r=5,$fn=36);
+    }
+
+    translate([0,16,10+6]) rotate([90,0,0]) ext20(30,fuzz,verbose=0);
+    translate([-26,-12,8]) cube([20,30,8]);
+
+    // 5mm bolt hole
+    cylinder(r=m5rad+fuzz,h=11,$fn=15);
+    translate([0,0,-4])
+       cylinder(r2=m5_head_radius,r1=m5_head_radius+.3,h=5,$fn=24);
+
+    // 2.4mm diam was good for M2.5.  go a little smaller for #2
+    translate([-16.5,10,-1]) for(a=[0,1])
+       translate([9.5*a,0,-1]) cylinder(r=2.3/2, h=11, $fn=11);
+
+    // extra clearance for extrusion nut
+    translate([0,0,8.8]) cube([10,16,4],center=true);
+    translate([0,0,6  ]) cylinder(r=3.5+.2,h=4,$fn=17);
+  }
+
+  %translate([-9.5/2-7,10,-3]) rotate([-90,0,0]) microswitch();
+}
+
+microswitchEndstop20v(.1);
+
+// support (not helpful with current shallow countersink... just clean up with drill bit)
+%color("Cyan") {
+  difference() {
+    cylinder(h=.8,r=3.5,$fn=10);
+    translate([0,0,-1]) cylinder(h=7,r=3.2,$fn=10);
+  }
+}
\ No newline at end of file
diff --git a/ext15.scad b/ext15.scad
new file mode 100644
index 0000000..4a73c49
--- /dev/null
+++ b/ext15.scad
@@ -0,0 +1,56 @@
+module slotT1(w,rs,re,len) {
+$fn=24;
+  hull() {
+    translate([-w/2+re,-rs-re+.2,0]) cylinder(r=re,h=len);
+    translate([   -1   , -8  ,0]) cube([1,8-rs+1.45,len]);
+    translate([-w/2-0.5,-10  ,0]) cube([w/2,1,len]);
+  }
+}
+
+module slotT(len) {
+rs=3.56/2;
+w=15;
+d=5;
+re=0.5;
+$fn=24;
+  difference() {
+    translate([-w/2-2,-9,0]) cube([w/2+2,18,len]);
+
+    translate([0,0,-1]) difference() {
+      union() {
+        translate([-w/2+d-rs,-10,0]) cube([6,20,len+2]);
+        slotT1(w,rs,re,len+2);
+        mirror([0,1,0]) slotT1(w,rs,re,len+2);
+      }
+
+      translate([-w/2, 0 ,-1]) hull() {
+        translate([d-rs,0,0]) cylinder(r=rs-0.5,h=len+2);
+        translate([0,-rs+.2,0]) cube([0.1,2*rs-.4,len+2]);
+      }
+    }
+  }
+}
+
+module ext15(len) {
+w=15;
+//sw = 3;
+ro=1;
+$fn=24;
+  difference() {
+    hull() {
+      translate([-w/2+ro,-w/2+ro,0]) cylinder(r=ro,h=len);
+      translate([-w/2+ro, w/2-ro,0]) cylinder(r=ro,h=len);
+      translate([ w/2-ro, w/2-ro,0]) cylinder(r=ro,h=len);
+      translate([ w/2-ro,-w/2+ro,0]) cylinder(r=ro,h=len);
+    }
+
+    translate([0,0,-1]) {
+      for (a=[0,90,180,270]) {
+        rotate([0,0,a])
+          slotT(len+2);
+      }
+    }
+  }
+}
+
+ext15(5);
diff --git a/ext15ob.scad b/ext15ob.scad
new file mode 100644
index 0000000..f39eea2
--- /dev/null
+++ b/ext15ob.scad
@@ -0,0 +1,59 @@
+module slotT1(w,rs,re,len) {
+$fn=24;
+  hull() {
+    translate([-w/2+re,-rs-re,0]) cylinder(r=re,h=len);
+    translate([   -1   , -8  ,0]) cube([1,8-rs+1.2,len]);
+    translate([-w/2-0.5,-10  ,0]) cube([w/2,1,len]);
+  }
+}
+
+// rs -- radius of slot (slot width/2)
+// d  -- depth  of slot
+module slotT(w,rs,d,len) {
+re=0.3;
+$fn=24;
+  difference() {
+    translate([-w/2-2,-9,0]) cube([w/2+2,18,len]);
+
+    translate([0,0,-1]) difference() {
+      union() {
+        translate([-w/2+d-rs,-10,0]) cube([6,20,len+2]);
+        mirror([0,1,0]) slotT1(w,rs,re,len+2);
+                        slotT1(w,rs,re,len+2);
+      }
+
+      translate([-w/2, 0 ,-1]) hull() {
+        translate([d-rs,0,0]) cylinder(r=rs-0.5,h=len+2);
+        translate([0,-rs+.2,0]) cube([0.1,2*rs-.4,len+2]);
+      }
+    }
+  }
+}
+
+module ext15(len,fuzz=0) {
+w=15;
+
+wz = w + fuzz;
+w1 = wz-abs(fuzz)*2;
+  difference() {
+    union() {
+      translate([0,0,len/2]) cube([wz,wz,len],center=true);
+      if (abs(fuzz) > 0) { // extra room on corners, where slop can be a problem 
+        for(i=[-1,1]) for(j=[-1,1])
+          translate([i*w1/2,j*w1/2,0])
+           cylinder(r=abs(fuzz)*2,h=len,$fn=8);
+      }
+    }
+
+    translate([0,0,-1]) {
+      for (a=[0,90,180,270]) {
+        rotate([0,0,a])
+          slotT(wz,3.2/2-fuzz,4.5-fuzz,len+2);
+      }
+    }
+  }
+}
+
+ext15(2,0.2);
+ext15(4);
+translate([0,0,3.98]) ext15(2,-0.1);
diff --git a/ext20.scad b/ext20.scad
new file mode 100644
index 0000000..daae2e1
--- /dev/null
+++ b/ext20.scad
@@ -0,0 +1,56 @@
+module slotT625a(w,rs,re,len) {
+$fn=24;
+  hull() {
+    translate([-w/2+re,-rs-re,0]) cylinder(r=re,h=len);
+    translate([  -1   ,-rs-5 ,0]) cube([1,7,len]);
+    translate([-w/2-0.5,-10  ,0]) cube([w/2,1,len]);
+  }
+}
+
+module slotT625(len,fuzz) {
+rs=6.25/2-fuzz;
+d=6;
+re=0.5;
+$fn=24;
+w=20+fuzz*2;
+  difference() {
+    translate([-w/2-2,-9,0]) cube([w/2+2,18,len]);
+
+    translate([0,0,-1]) difference() {
+      union() {
+        translate([-w/2+3,-10,0]) cube([w/2-2,20,len+2]);
+        slotT625a(w,rs,re,len+2);
+        mirror([0,1,0]) slotT625a(w,rs,re,len+2);
+      }
+
+      translate([-w/2,0,-1]) hull() {
+        translate([0,-rs,0]) cube([0.1,2*rs,len+2]);
+        translate([d-rs+.5,0,0]) cylinder(r=rs-.5,h=len+2);
+      }
+    }
+  }
+}
+
+module ext20(len,fuzz) {
+w=20+fuzz*2;
+ro=1;
+$fn=24;
+  difference() {
+    hull() {
+      translate([-w/2+ro,-w/2+ro,0]) cylinder(r=ro,h=len);
+      translate([-w/2+ro, w/2-ro,0]) cylinder(r=ro,h=len);
+      translate([ w/2-ro, w/2-ro,0]) cylinder(r=ro,h=len);
+      translate([ w/2-ro,-w/2+ro,0]) cylinder(r=ro,h=len);
+    }
+
+    translate([0,0,-1]) {
+      for (a=[0,90,180,270]) {
+        rotate([0,0,a])
+          slotT625(len+2,fuzz);
+      }
+      %cylinder(r=4.25/2,h=len+2);
+    }
+  }
+}
+
+ext20(5,0.2);
diff --git a/ext20v.scad b/ext20v.scad
new file mode 100644
index 0000000..c400c56
--- /dev/null
+++ b/ext20v.scad
@@ -0,0 +1,60 @@
+// cut-out model to fit Openbuilds V-Slot 20mm extrusion
+
+// fuzz is -1/2 kerf for a laser cutter,
+// or the amount of extrusion spread for a 3D printer
+
+module slotV(len,fuzz,verbose) {
+// center of square cylinder for V cut-out is 1mm outside of extrusion.
+// outside border of extrusion is 1.9mm.  inner slot width is 6.35mm, but
+// corners are beveled, so ideal corner would be less
+// 1/2 slot width is the same dist as sr-(1+1.9), hence
+sr = 1+1.9+(6.2/2);
+  difference() {
+    // having testing trouble.  I don't want to worry about v-slot tab yet.
+    // make it extra small until I'm really ready to tweak it (remove -.3)
+    translate([-10-1,0,0]) cylinder(r=sr-fuzz*sqrt(2)-.3,h=len,$fn=4);
+    translate([-8+.3+4/2,0,len/2]) cube([4,7,len],center=true);  // arbitrary .3mm extra lip to tab
+  }
+
+  // actual slot profile
+  if(verbose % 2) %hull() {
+    translate([-10+2+1.2/2,0,len/2]) cube([1.2,10.6,len],center=true);
+    translate([-5,0,len/2]) cube([2,4,len],center=true);
+  }
+}
+
+module ext20(len,fuzz=0,verbose=3) {
+w=20+2*fuzz;
+w2f = w/2 - 0.6*abs(fuzz);  // offset to center of corner stress relief loop
+rc = (abs(fuzz) < 0.1) ? 0.2 : 2*abs(fuzz);  // radius of corner releif loop
+ro=1;
+$fn=24;
+  difference() {
+    union() {
+      translate([0,0,len/2]) cube([w,w,len],center=true);
+      for(i=[-1,1]) for(j=[-1,1]) // extra clearance around corners
+        translate([w2f*i,w2f*j,0]) cylinder(r=rc,h=len,$fn=8);
+    }
+
+    translate([0,0,-1]) {
+      for (a=[0,90,180,270]) {
+        rotate([0,0,a])
+          slotV(len+2,fuzz,verbose);
+      }
+      if (floor(verbose/2) % 2) %cylinder(r=2,h=len+2);
+    }
+  }
+}
+
+if (0) { // notional display
+  translate([0,0,4]) ext20(5,0.2);
+  ext20(5,0);
+  translate([0,0,-4]) ext20(5,-0.2);
+} else {
+  // quality of fit cutout test cut/print
+  projection(cut=true)
+  difference() {
+    cube([30,30,10],center=true);
+    translate([0,0,-12/2]) ext20(12,-0.15); // quelab laser cutter
+  }
+}
diff --git a/extruder.scad b/extruder.scad
index bc9a4d0..a0aad00 100644
--- a/extruder.scad
+++ b/extruder.scad
@@ -5,14 +5,28 @@ include <configuration.scad>;
 
 filament_offset = 22.5;
 
+// This is slightly larger than the actual bearing to allow some spinning clearance
+module bearingSpace() {
+bearingRadius=16/2;
+bearingWidth=5;  // outside part
+hubRadius=7.75/2;
+hubInset=0.5;
+union() {
+  difference() {
+    cylinder(r=bearingRadius+0.5,h=bearingWidth+2*hubInset);
+    translate([0,0,-.1]) cylinder(r=hubRadius-0.2,h=bearingWidth+2);
+  }
+  translate([0,0,hubInset]) cylinder(r=hubRadius+1,h=bearingWidth);
+}}
+
 module extruder() {
   rotate([90, 0, 0]) difference() {
     union() {
       //main cylinder
-      translate([16,20,21]) rotate([90,0,0]) cylinder(h=20, r=17.5);
+      translate([16,20,21]) rotate([90,0,0]) cylinder(h=20, r=17.5, $fn=48);
 
       //bearing mount
-      translate([31,20,21]) rotate([90,0,0]) cylinder (h=20, r=8);
+      translate([31,20-3,21]) rotate([90,0,0]) cylinder (h=20-3, r=8);
 
       //pushfit/pneufit mount
       translate([filament_offset, 6.5, 13])
@@ -22,15 +36,19 @@ module extruder() {
       translate([21.75,6.5,34]) rotate([0,0,0]) cylinder (h=8, r=3, $fn=12);
 
       //clamp
-      translate([20, 0, 28]) cube([13, 20, 14]);
+      translate([20, 0, 28-2.4]) cube([13, 20, 14+2.5]);
     }
 
     //pulley opening
     translate([16,21,21]) rotate([90,0,0]){
-      cylinder (h=22, r=6.6);
+      cylinder (h=22, r=6.7+.1, $fn=48);
 
+      // Holes for screws to mount into gearhead
       rotate([0,0,45]) {
-        //translate([14,0,0]) cylinder(h=22, r=1.6, $fn=12);
+        // smear hole where tab flexes to go around bolt
+        hull() { translate([15,-.8,0]) cylinder(h=22, r=1.9, $fn=12);
+        translate([14,0,0]) cylinder(h=22, r=1.6, $fn=12); }
+
         translate([0,14,0]) cylinder(h=22, r=1.6, $fn=12);
         translate([-14,0,0]) cylinder(h=22, r=1.6, $fn=12);
         translate([0,-14,0]) cylinder(h=22, r=1.6, $fn=12);
@@ -41,28 +59,37 @@ module extruder() {
     translate([16,21,21]) rotate([90,0,0]) cylinder (h=3.35, r=11.25);
 
     //pulley hub indentation
-    translate([16,20-2,21]) rotate([90,0,0]) cylinder (h=5.6, r=7);
+    // my little groved drive does not need this (ab)
+    //translate([16,20-2,21]) rotate([90,0,0]) cylinder (h=5.6, r=7);
+    // however, the set screw does stick out, so it needs a little extra at the top
+    translate([16,18,21]) rotate([90,0,0]) cylinder (h=7, r=7.5);
 
     //bearing screws
-    translate([31,21,21]) rotate([90,0,0]) cylinder (h=22, r=2.6, $fn=12);
-    #translate([31,22,21]) rotate([90,30,0]) cylinder (h=8.01, r=4.7, $fn=6);
+    translate([31,21,21]) rotate([90, 0,0]) cylinder (h=22  , r=2.6, $fn=16);
+    translate([31,22,21]) rotate([90,30,0]) cylinder (h=8.01, r=4.7, $fn=6);
 
     //bearing
-    difference() {
+    // slic3r 9.9 or before overhang fill works for me (ab)
+    //        1.0+ fill does not work at all.  almost anywhere ;-(
+    //difference() {
       union() {
-        translate([31,9.5,21]) rotate([90,0,0]) cylinder (h=5.25, r=8.5);
-        translate([31,9.5-5.25,21-8.25-2]) cube([20, 5.25, 18.5]);
+        // instead of just cylinder, make little extra space to spin freely
+        //translate([31,9.5+0.75,21]) rotate([90,0,0]) #cylinder (h=5.25, r=8.5);
+        translate([31,9.5+0.6,21]) rotate([90,0,0]) bearingSpace();
+
+        //translate([31,9.5+0.6-5.25-.4,21-8.25-2]) #cube([20, 5.25, 18.5]);
         //opening between bearing and pulley
-        translate([20,9.5-5.25,21-8.25+3.25+1]) cube([10, 5.25, 8]);
+        translate([20,9.5+0.75-5.25-.5,21-8.25+3.25+1]) #cube([6, 5.25, 8]);
       }
-      //removable supports
-      for (z = [15:3:27]) {
-        translate([36, 10, z]) # cube([20, 20, 0.5], center=true);
-      }
-    }
+
+      ////removable supports
+      //for (z = [15:3:27]) {
+      //  translate([36, 10, z])  cube([20, 20, 0.5], center=true);
+      //}
+    //}
 
     //filament path chamfer
-    translate([filament_offset,6.5,15]) rotate([0,0,0]) #
+    translate([filament_offset,6.5,15]) rotate([0,0,0])
       cylinder(h=3, r1=0.5, r2=3, $fn=12);
 
     //filament path
@@ -70,10 +97,11 @@ module extruder() {
       cylinder(h=60, r=1.1, $fn=12);
 
     //pushfit/pneufit mount
-    translate([filament_offset, 6.5, 0]) # cylinder(r=2.3, h=8, $fn=12);
+    translate([filament_offset, 6.5, 0]) cylinder(r=2.3, h=8, $fn=12);
 
     //clamp slit
     translate([25,-1,10]) cube([2, 22, 35]);
+    translate([25.5,-1,34]) rotate([0,10,0]) cube([1.5, 22, 10]);
     //clamp nut
     translate([10.5,12,38]) rotate([0,90,0])
       cylinder(h=11, r=m3_nut_radius, $fn=6);
@@ -83,4 +111,8 @@ module extruder() {
   }
 }
 
-extruder();
+// adding brim for quelab print
+union(){
+translate([-20,22,.32]) extruder();
+color("Cyan") cylinder(h=.4,r=25,$fn=6);
+}
\ No newline at end of file
diff --git a/extruder.stl b/extruder.stl
deleted file mode 100644
index 90d7eb7..0000000
Binary files a/extruder.stl and /dev/null differ
diff --git a/extruderMount.scad b/extruderMount.scad
new file mode 100644
index 0000000..808188b
--- /dev/null
+++ b/extruderMount.scad
@@ -0,0 +1,47 @@
+// this one turns the extruder motor on it's side relative to the extrusion rail
+
+include <configuration.scad>;
+
+module shortNema17body() {
+  intersection() {
+    translate([0,0,-.1]) cylinder(r=50/2,h=16.2,$fn=120);
+    cube([42,42,40],center=true);
+  }
+  nema17end(9);
+  translate([0,0,16+8]) nema17end(8);
+  translate([0,0,16+8+5]) cylinder(h=21,r=36/2,$fn=80);
+}
+module nema17end(thick) {
+  translate([-21,-21,-thick]) intersection() {
+    cube([42,42,thick]);
+    translate([21,-16,-1]) rotate([0,0,45]) cube([52.5,52.5,10]);
+  }
+}
+
+module extruderMount() {
+  difference() {
+    union() {
+      translate([-15,-7.5,0]) cube([30,15,20]);
+
+      intersection() {
+        translate([-21.2,-15,23]) rotate([0,45,0]) cube([30,30,30]);
+        translate([-18,-16,8]) cube([36,32,50]);
+      }
+    }
+
+    // bolt holes
+    //for (x=[-11, 0, 11]) {
+    for (x=[-8, 8]) {
+      translate([x,0,-1]) {
+        cylinder(r=m3_wide_radius, h=10, $fn=12);
+        #translate([0, 0, 4.7]) cylinder(r1=2.8, r2=3.5, h=25, $fn=24);
+      }
+    }
+
+    translate([0,-8.2,40]) rotate([-90,45,0])
+      #scale([1.007,1.007,1.01]) shortNema17body();
+  }
+}
+
+extruderMount();
+
diff --git a/extrusionTab.svg b/extrusionTab.svg
new file mode 100644
index 0000000..ccdf5a9
--- /dev/null
+++ b/extrusionTab.svg
@@ -0,0 +1,159 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
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+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
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+   height="354.33069"
+   id="svg2"
+   version="1.1"
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+   sodipodi:docname="extrusionTab.svg">
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+</svg>
diff --git a/frameBot.scad b/frameBot.scad
new file mode 100644
index 0000000..2f02aff
--- /dev/null
+++ b/frameBot.scad
@@ -0,0 +1,17 @@
+
+use <vertexB.scad>;
+use <nema17.scad>;
+
+module frameBot() {
+  difference() {
+    vertexB(45);
+
+    translate([0,12,45/2]) rotate([90,0,0]) {
+      #nema17holes();
+      //translate([0,0,2])%nema17();
+    }
+
+  }
+}
+
+frameBot();
diff --git a/frame_extruder.scad b/frame_extruder.scad
index fc3fb04..11ca2b9 100644
--- a/frame_extruder.scad
+++ b/frame_extruder.scad
@@ -20,4 +20,7 @@ module frame_extruder() {
   }
 }
 
-frame_extruder();
+union() {
+  translate([0,0,.17]) frame_extruder();
+  color("Cyan") cube([15.2,29.2,0.4],center=true);
+}
\ No newline at end of file
diff --git a/frame_extruder.stl b/frame_extruder.stl
deleted file mode 100644
index 260fe75..0000000
Binary files a/frame_extruder.stl and /dev/null differ
diff --git a/frame_motor.scad b/frame_motor.scad
index d83cd8f..3939b92 100644
--- a/frame_motor.scad
+++ b/frame_motor.scad
@@ -5,34 +5,50 @@ use <nema17.scad>;
 
 $fn = 24;
 
+module motorScrewsAndAccess(){
+  translate([0, motor_offset, 0]) {
+    // Motor shaft/pulley cutout.
+    rotate([90, 0, 0]) cylinder(r=12, h=20, center=true, $fn=60);
+    // NEMA 17 stepper motor mounting screws.
+    for (x = [-1, 1]) for (z = [-1, 1]) {
+      scale([x, 1, z]) translate([15.5, -5, 15.5]) {
+        rotate([90, 0, 0]) cylinder(r=1.65, h=20, center=true, $fn=12);
+        // Easier ball driver access.
+        //rotate([74, -30, 0]) cylinder(r=1.8, h=60, $fn=12);
+      }
+    }
+  }
+}
+
+module motorCablePaths() {
+  for (mirror = [-1, 1]) scale([mirror, 1, 1]) {
+    translate([-35, 45, 0]) rotate([0, 0, -30])
+      cube([4, 15, 15], center=true);
+    //translate([-6, 0, 0]) cylinder(r=2.5, h=40);
+    //translate([-11, 0, 0]) cube([15, 4, 15], center=true);
+  }
+}
+
 module frame_motor() {
   difference() {
     // No idler cones.
     vertex(3*extrusion, idler_offset=0, idler_space=100);
+
     // KOSSEL logotype.
-    translate([20.5, -10, 0]) rotate([90, -90, 30])
-      scale([0.11, 0.11, 1]) import("logotype.stl");
-    // Motor cable paths.
-    for (mirror = [-1, 1]) scale([mirror, 1, 1]) {
-      translate([-35, 45, 0]) rotate([0, 0, -30])
-        # cube([4, 15, 15], center=true);
-      translate([-6, 0, 0]) cylinder(r=2.5, h=40);
-      translate([-11, 0, 0]) # cube([15, 4, 15], center=true);
-    }
-    translate([0, motor_offset, 0]) {
-      // Motor shaft/pulley cutout.
-      rotate([90, 0, 0]) cylinder(r=12, h=20, center=true, $fn=60);
-      // NEMA 17 stepper motor mounting screws.
-      for (x = [-1, 1]) for (z = [-1, 1]) {
-        scale([x, 1, z]) translate([15.5, -5, 15.5]) {
-          rotate([90, 0, 0]) cylinder(r=1.65, h=20, center=true, $fn=12);
-          // Easier ball driver access.
-          rotate([74, -30, 0]) # cylinder(r=1.8, h=60, $fn=12);
-        }
-      }
-    }
+    //translate([20.5, -10, 0]) rotate([90, -90, 30])
+    //  scale([0.11, 0.11, 1]) import("logotype.stl");
+
+    //motorCablePaths();
+    motorScrewsAndAccess();
+
     translate([0, motor_offset, 0]) rotate([90, 0, 0]) % nema17();
+
   }
 }
 
-translate([0, 0, 22.5]) frame_motor();
+union() {
+translate([0, 0, 22.5+0.34]) frame_motor();
+vertexPad();
+mirror([1,0,0]) endBrace(3*extrusion);
+                endBrace(3*extrusion);
+}
diff --git a/frame_motor.stl b/frame_motor.stl
deleted file mode 100644
index 503c886..0000000
Binary files a/frame_motor.stl and /dev/null differ
diff --git a/frame_top.scad b/frame_top.scad
index 2285cac..7353b6e 100644
--- a/frame_top.scad
+++ b/frame_top.scad
@@ -1,23 +1,39 @@
-include <configuration.scad>;
+//include <configuration.scad>;
+extrusion=15;
 
 use <vertex.scad>;
 
 $fn = 24;
 
 module frame_top() {
+m3nutRad = 5.45/2/cos(30) + 0.1;
   difference() {
-    vertex(extrusion, idler_offset=3, idler_space=12.5);
+    vertex(extrusion);
+
     // M3 bolt to support idler bearings.
-    translate([0, 65, 0]) rotate([90, 0, 0]) #
-      cylinder(r=m3_radius, h=55);
+    //translate([0, 65, 0]) rotate([90, 0, 0]) cylinder(r=m3_radius, h=55);
+
     // Vertical belt tensioner.
-    translate([0, 10, 0]) rotate([18, 0, 0]) union() {
-      cylinder(r=m3_wide_radius, h=30, center=true);
-      translate([0, -3, 8]) cube([2*m3_wide_radius, 6, 12], center=true);
-      translate([0, 0, -2]) scale([1, 1, -1]) rotate([0, 0, 30]) #
-        cylinder(r1=m3_nut_radius, r2=m3_nut_radius+1, h=10, $fn=6);
+    %translate([0, 10, 0]) rotate([18, 0, 0]) union() {
+      cylinder(r=2.94/2+.2, h=30, center=true);
+      //translate([0, -3, 8]) cube([2*m3_wide_radius, 6, 12], center=true);
+      translate([0, 0, -2]) scale([1, 1, -1]) rotate([0, 0, 30])
+        cylinder(r1=m3nutRad-0.1, r2=m3nutRad+0.3, h=10, $fn=6);
     }
   }
 }
 
-translate([0, 0, 7.5]) frame_top();
+use <support.scad>;
+
+union() {
+  translate([0, 0, 7.5]) rotate([0,180,0]) frame_top();
+  //vertexPad();
+  mirror([1,0,0]) endBrace(extrusion);
+                  endBrace(extrusion);
+
+  color("Cyan") { // support material
+    for (a=[-1,1]) supportPillar(18.2*a,-1,5);
+    translate([0,0,5]) supportPillar(0,-5,5,r=0.7);
+  }
+
+}
diff --git a/frame_top.stl b/frame_top.stl
deleted file mode 100644
index 05bf6ba..0000000
Binary files a/frame_top.stl and /dev/null differ
diff --git a/frogCarriage.scad b/frogCarriage.scad
new file mode 100644
index 0000000..85219b4
--- /dev/null
+++ b/frogCarriage.scad
@@ -0,0 +1,282 @@
+include <configuration.scad>;
+use <beltCatch.scad>;
+
+separation = 40;  // width of rod mount cones
+thickness = 6;
+
+horn_thickness = 13;
+horn_x = 8;
+
+belt_width = 6;
+belt_x = 5.6;
+belt_z = 7;
+
+// Parameters for wheeled base
+base_thickness = 11; // wheel carriage level thickness
+wheel_radius = 8; // delrin wheels
+extrusion_width = 15;
+wheel_offset = 22;  // wheel pair wheelbase
+m3_head_radius=5.36/2+0.2;
+boltSep = 10; // tension bolt seperation half-dist
+m3rad = 2.94/2+0.1;  // tight fit, at least for vertical m3 screw holes.
+
+module carriage() {
+  // Timing belt (up and down).
+  translate([-belt_x, 0, belt_z + belt_width/2]) %
+    cube([1.7, 100, belt_width], center=true);
+  translate([belt_x, 0, belt_z + belt_width/2]) %
+    cube([1.7, 100, belt_width], center=true);
+  difference() {union() {
+      // Main body
+      hull() {
+        translate([-9.5,-15,-.5])         cube([19.2,30,1]);
+        translate([-9.5, -8,thickness-1]) cube([19.2,16,1]);
+      }
+
+      // Ball joint mount horns.
+      for (x = [-1, 1]) {
+        scale([x, 1, 1]) intersection() {
+          translate([0, 0, horn_thickness/2])
+            cube([separation, 18, horn_thickness], center=true);
+          translate([horn_x, 0, horn_thickness/2]) rotate([0, 90, 0])
+            cylinder(r1=14, r2=2.5, h=separation/2-horn_x);
+        }
+      }
+
+      // side support
+      for (i=[-1,1]) { hull() {
+         translate([ 9.8*i,-7.5,12]) scale([1,2,1]) rotate([0,0,22.5]) cylinder(h=1,r=2,$fn=8);
+         translate([ 9.8*i, 7.5,12]) scale([1,2,1]) rotate([0,0,22.5]) cylinder(h=1,r=2,$fn=8);
+         translate([ 9.6*i,-18,0]) sphere(2,$fn=8);
+         translate([ 9.6*i, 18,0]) sphere(2,$fn=8);
+         translate([14*i,0,0]) cylinder(h=1,r=3,$fn=6);
+      }}
+
+      translate([2.1,-8.1,3.5]) rotate([0,0,180]) beltCatch(9.5);
+      translate([2.1, 8.1,3.5]) mirror([1,0,0])   beltCatch(9.5);
+
+      // belt catch support/fill
+      translate([ 3  ,-24,3.5]) cube([4,48,3.5]);
+      translate([-1.6,-16,3.5]) cube([6,32,3.5]);
+    }
+
+    // Screws for ball joints.
+    translate([0, 0, horn_thickness/2]) rotate([0, 90, 0]) 
+      cylinder(r=m3rad, h=60, center=true, $fn=13);
+    // Lock nuts for ball joints.
+    for (x = [-1, 1]) {
+      scale([x, 1, 1]) intersection() {
+        translate([horn_x, 0, horn_thickness/2]) rotate([90, 0, -90])
+          cylinder(r1=m3_nut_radius-0.2, r2=m3_nut_radius+0.5, h=8,
+                   center=true, $fn=6);
+      }
+    }
+  }
+}
+
+
+module wheelAxleBrace() {
+  intersection() {
+    cylinder(h=base_thickness+3,r=6,$fn=36);
+    translate([0,0,3]) scale([1,1,2.2]) sphere(6.5,$fn=36);
+  }
+}
+module wheelAxleHole(dHeadRad) {
+  translate([0,0,-30]) cylinder(h=60,r=m3rad,$fn=13);
+  translate([0,0,base_thickness-1])
+    cylinder(h=10,r1=m3_head_radius-.1+dHeadRad,
+                  r2=m3_head_radius+.5+dHeadRad,$fn=30);
+}
+module mobileWheelMount(dilation) {
+bthick = base_thickness + 2*dilation;
+br = wheel_radius-2 + 2*dilation;
+  difference() {
+    hull() {
+      intersection() {
+        cylinder(r=br+1,h=bthick,$fn=36);
+        if(dilation==0) translate([0,0,bthick*0.7])
+          scale([1,1,2]) sphere(br+0.5,$fn=36);
+      }
+      if (0) %translate([-br+2,0,base_thickness/2])
+        rotate([0,90,0]) for (a=[-boltSep,boltSep]) {
+          translate([0,a,0]) rotate([0,0,30])
+            cylinder(h=wheel_radius*2+99*abs(dilation),r=(bthick/2)/cos(30),$fn=6);
+        }
+      translate([-br+2,0,base_thickness/2])
+        rotate([0,90,0]) for (a=[-1,1]) {
+          translate([0,boltSep*a*1.0,0])
+            intersection() {
+              cylinder(h=wheel_radius*2+99*abs(dilation),
+                 r=bthick*0.6,$fn=60);
+              cube([bthick,30,40],center=true);
+            }
+        }
+    }
+    if (dilation==0) { // this is the ACTUAL mount, not a socket, add screw holes
+      translate([0,0,-2.2]) wheelAxleHole(0);
+      translate([0,0,bthick/2]) rotate([0,90,0]) {
+        for (i=[-boltSep,boltSep]) {
+          translate([0,i,-1]) wheelAxleHole(-0.1);
+        }
+      }
+    }
+  }
+}
+
+module cableCatchBrace() {
+$fn=12;
+  hull() {
+    translate([ 1,7,12]) scale([7,2,3]) sphere(1);
+    translate([24,-2,7]) scale([2,3,5]) sphere(1);
+    translate([ 7,-2,9]) scale([1,3,1]) sphere(1);
+    translate([12,-5,8]) cube([16,1,4],center=true);
+  }
+
+  // more bracing for under belt catch
+  hull() {
+    translate([-5,-8,14]) scale([3,1,1]) sphere(1);
+    translate([-4, 2,14]) scale([6,1,1]) sphere(1); 
+    translate([-7, 3, 2]) scale([8,1,1]) sphere(1);
+  }
+
+}
+
+module wheelBase() {
+dx = extrusion_width/2+wheel_radius-0.5;  // wheel rides roughly 0.5mm inside rail
+supportSpread = 6;
+  difference() {
+    union() {
+      for (i=[-wheel_offset,wheel_offset]) {
+        hull() { // main wheel axle screw holder pair
+          translate([-dx, i,0]) wheelAxleBrace();
+          translate([-dx+10,(i<0)?i+11:i-11,10])
+            sphere(1,$fn=6);
+        }
+      }
+
+      // tension screw housing pair
+      translate([0,0,base_thickness/2]) rotate([0,90,0]) {
+        for (i=[-1,1]) {
+          hull() translate([0,i*boltSep,-20]) {
+            cylinder(r=5,h=41,$fn=36);
+            translate([5.43,0,16.5]) cube([.1,2,32],center=true);
+          }
+        }
+      }
+
+      // brace section for mobile mount 
+      hull() {
+        //%translate([16,0,base_thickness/2]) cube([24, 44,base_thickness],center=true);
+        for(a=[-1,1]) translate([4,15*a,base_thickness/2])
+          rotate([0,90,0]) rotate([0,0,22.5])
+            cylinder(r=base_thickness/2/cos(22.5),h=23,$fn=8);
+        translate([-6,0,base_thickness]) cube([1,14,.1],center=true);
+      }
+
+      // brace between main fixed wheel axles
+      //%translate([-dx-2,-16,0]) cube([ 7,32,base_thickness]);
+      hull() for(i=[-wheel_offset,wheel_offset])
+        translate([-dx+1,i,6]) scale([1.5,.1,3]) sphere(2,$fn=36);
+
+      // extra bracing from belt catch to mobile mount rails
+      translate([0,-15,1])                 cableCatchBrace();
+      translate([0, 15,1]) mirror([0,1,0]) cableCatchBrace();
+    }
+
+    // Adjustable tension screw holes
+    translate([0,0,base_thickness/2]) rotate([0,90,0]) {
+      for(i=[-boltSep,boltSep]) {
+        translate([0,i,-24]) {
+          cylinder(r=m3rad,h=60,$fn=13);
+          cylinder(r1=m3_nut_radius+.4, r2=m3_nut_radius-.2, h=7, $fn=6);
+        }
+      }
+    }
+  }
+}
+
+module wheelBaseHoles() {
+dx = extrusion_width/2+wheel_radius;
+  for (a=[-wheel_offset,wheel_offset])
+    translate([-dx+0.5,a,1]) wheelAxleHole(0);
+  translate([dx-2  ,0,0  ]) mobileWheelMount(.2); // dilated version for main slot
+  translate([dx-2.5,0,0.5]) mobileWheelMount(-.1); // shrunk, and shifted up to raise ceiling a bit
+}
+
+module earBrace() {
+  intersection () {
+    hull() {
+      rotate([0,55,0]) scale([2,1,1]) cylinder(r=.4,h=7,$fn=12);
+      linear_extrude(height=0.1)
+        polygon(points=[[0,0],[7,1.5],[7,-1.5]], paths=[[0,1,2,0]]);
+    }
+    translate([-2,-5,0]) cube([10,10,10]);
+  }
+}
+
+module frogCarriage() {
+  difference() {
+    union() {
+      translate([0,0,base_thickness-.4]) mirror([1,0,0]) carriage();
+      wheelBase();
+    }
+
+    wheelBaseHoles();
+
+    // extra clearance for extrusion rail
+    translate([-9, -30,-.1]) cube([18,60,1.5]);
+  }
+}
+
+module supportPillar(x,y,len,rot=0,r=2,xscale=1) {
+  translate([x,y,0]) difference() {
+                          rotate([0,0,rot]) scale([xscale,1,1]) cylinder(r=r    ,h=len  ,$fn=6);
+    translate([0,0,-0.5]) rotate([0,0,rot]) scale([xscale,1,1]) cylinder(r=r-.25,h=len+1,$fn=6);
+  }
+}
+module supportPillar4(x,y,dx,dy,dz,rot=0) {
+t=0.3;
+x0 = x + ((x<0)?dx:-dx)/2;
+y0 = y + ((y>0)?dy:-dy)/2;
+  translate([x0,y0,dz/2]) rotate([0,0,rot]) difference() {
+    cube([dx  ,dy  ,dz  ],center=true);
+    cube([dx-t,dy-t,dz+1],center=true);
+  }
+}
+
+use <endstop.scad>;
+%translate([0,33,6.5]) rotate([180,0,0]) endstopCarriage();
+
+%translate([extrusion_width/2+wheel_radius-1+22*0,0,0]) mobileWheelMount(0);
+
+union() {
+  frogCarriage();
+
+  // support structures
+  //if(0) 
+  color("Cyan") {
+    translate([ 17.3,0,base_thickness+.9])                 scale([0.5,0.6,0.7]) earBrace();
+    translate([-17.3,0,base_thickness+.9]) mirror([1,0,0]) scale([0.5,0.6,0.7]) earBrace();
+    for (i=[-1,1]) {
+      supportPillar(19.3*i,0,12.2,r=1.5);  // under horn earBrace()'s
+
+      // horn overhang
+      supportPillar(14,12  *i,base_thickness+.4,r=1.2,xscale=3.5);
+      supportPillar(12, 8.5*i,base_thickness+.4,-30*i,xscale=2.5,r=1.3);
+      supportPillar(12.6,4*i,base_thickness+.4,-38*i,r=1.2,xscale=4);
+
+      supportPillar(5.5,16.3*i,2,r=1.5);
+      supportPillar4(8,14*i,5,4.5,2);
+      supportPillar4(-8,7.2*i,16,5.4,2);
+      supportPillar4(-6,9*i,12,2,2);
+
+      supportPillar(5,4*i,2,70*i,r=1.2,xscale=2);
+      supportPillar(8.5,3.3*i,13,i*17,r=1.2);
+      //supportPillar(-9,3*i,12,10*i,r=1.5);
+      //supportPillar(-3.5,3.5*i,11,xscale=2.5,r=1.3);
+    }
+    supportPillar(11,0,base_thickness+.4,xscale=2,r=2);
+    supportPillar(4.5,0,2,r=1.2);
+    supportPillar(-5.5,0,12,r=2,xscale=2);
+  }
+}
diff --git a/frogCarriage20v.scad b/frogCarriage20v.scad
new file mode 100644
index 0000000..93fb2df
--- /dev/null
+++ b/frogCarriage20v.scad
@@ -0,0 +1,306 @@
+// frog carriage design, for OpenBuilds 20mm V-slot extrusion,
+// with low-profile OpenBuilds solid v-wheels
+
+include <configuration.scad>;
+use <beltCatch.scad>;
+use <rodMountHorn.scad>;
+
+thickness = 6;
+
+
+belt_width = 6;
+belt_x = 5.6;
+belt_z = 7;
+
+extrusion_width = 20;
+
+// Parameters for wheeled base
+base_thickness = 11; // wheel carriage level thickness
+wheel_radius = 15.23/2; // openbuilds solid low-profile v delrin wheels
+wheel_slot_penetration = 1.75; // wheel rides this far inside slot
+wheel_dx = extrusion_width/2+wheel_radius-wheel_slot_penetration;
+
+
+wheel_offset = 25;  // wheel pair wheelbase
+boltSep = 12; // tension bolt seperation half-dist
+
+m3_head_radius=5.36/2+0.2;
+m3rad = 2.94/2+0.15;  // tight fit, at least for vertical m3 screw holes.
+m3nutRad = 5.45/2/cos(30);
+
+m5rad = 4.92/2 + 0.2;//4.88/2;
+m5_head_radius = 8.62/2;//8.5/2;  // 5mm head height, uses 4mm hex drive
+
+hornAxisHeight = 13/2;
+
+/* 40mm separation version
+module ballJointMountHorns() {
+separation = 40;  // width of rod mount cones
+horn_thickness = 13;
+horn_x = 8;
+      #for (x = [-1, 1]) {
+        scale([x, 1, 1]) intersection() {
+          translate([0, 0, horn_thickness/2])
+            cube([separation, 18, horn_thickness], center=true);
+          translate([horn_x, 0, horn_thickness/2]) rotate([0, 90, 0])
+            cylinder(r1=14, r2=2.5, h=separation/2-horn_x);
+        }
+      }
+}
+*/
+
+// for 50mm separation
+module ballJointMountHorns() {
+  translate([0,0,hornAxisHeight])
+    difference() {
+      intersection() {
+        rodMountHorn();  // for 50mm separation
+        cube([51,16,hornAxisHeight*2],center=true);
+      }
+      translate([-2,0,0]) cube([16,50,22],center=true);
+    }
+}
+
+module carriage() {
+  // Timing belt (up and down).
+  for (a=[-1,1]) translate([a*belt_x, 0, belt_z + belt_width/2])
+     %cube([1.7, 100, belt_width], center=true);
+
+  difference() {
+    union() {
+      // Main body
+      hull() {
+        translate([-9.5,-15,-.5])         cube([19.2,30,1]);
+        translate([-9.5, -8,thickness-1]) cube([19.2,16,1]);
+      }
+
+      ballJointMountHorns();
+ 
+      // side support
+      for (i=[-1,1]) hull() {
+        translate([10.6*i,0,12]) scale([1, 6  ,1]) cylinder(h=1 ,r=2,$fn=12);
+        translate([ 9  *i,0, 0]) scale([1,10.9,1]) cylinder(h=.1,r=2,$fn=18);
+
+        translate([18*i,0,2]) cylinder(h=7,r=3,$fn=6);
+      }
+
+      translate([2.1,-8.1,3.5]) rotate([0,0,180]) beltCatch(9.5);
+      translate([2.1, 8.1,3.5]) mirror([1,0,0])   beltCatch(9.5);
+
+      // belt catch support/fill
+      translate([ 3  ,-24,3.5]) cube([4,48,3.5]);
+      translate([-1.6,-16,3.5]) cube([6,32,3.5]);
+    }
+
+    // Screws for ball joints.
+    translate([0,0,hornAxisHeight]) rodMountHornBore(boreLen=13);
+
+  }
+}
+
+
+module wheelAxleBrace() {
+  intersection() {
+    cylinder(h=base_thickness+5,r=7,$fn=36);
+    translate([0,0,-5.3]) scale([1,1,2.5]) sphere(10,$fn=36);
+  }
+}
+module wheelAxleHole(dHeadRad) {
+  translate([0,0,-30]) cylinder(h=60,r=m3rad,$fn=13);
+  translate([0,0,base_thickness-1])
+    cylinder(h=9,r1=m3_head_radius-.1+dHeadRad,
+                 r2=m3_head_radius+.5+dHeadRad,$fn=30);
+}
+module wheelAxleHole5(dHeadRad) {
+  translate([0,0,-40]) cylinder(h=60,r=m5rad,$fn=13);
+  cylinder(h=11,r1=m5_head_radius-.1+dHeadRad,
+                  r2=m5_head_radius+.5+dHeadRad,$fn=30);
+}
+module mobileWheelMount(dilation) {
+bthick = base_thickness + 2*dilation;
+br = 7 + 2*dilation;
+  difference() {
+    hull() {
+      translate([-br,0,base_thickness/2])
+        rotate([0,90,0]) for (a=[-1,1]) {
+          translate([0,boltSep*a,0])
+            intersection() {
+              cylinder(h=18+99*abs(dilation),r=bthick*0.55,$fn=6);
+              cube([bthick,20,60],center=true);
+            }
+        }
+    }
+    if (dilation==0) { // this is the ACTUAL mount, not a socket, add screw holes
+      translate([0,0,bthick-5.1]) wheelAxleHole5(0);
+      translate([0,0,bthick/2  ]) rotate([0,90,0]) {
+        for (i=[-boltSep,boltSep]) {
+          translate([0,i,-1]) wheelAxleHole(-0.1);
+        }
+      }
+    }
+  }
+}
+
+module cableCatchBrace() {
+$fn=12;
+  hull() {
+    translate([ 1,7,12]) scale([7,2,3]) sphere(1);
+    translate([24,-2,7]) scale([2,3,5]) sphere(1);
+    translate([ 7,-2,9]) scale([1,3,1]) sphere(1);
+    translate([12,-boltSep+6,8]) cube([16,1,4],center=true);
+  }
+
+  // more bracing for under belt catch
+  hull() {
+    translate([-5,-8,14]) scale([3,1,1]) sphere(1);
+    translate([-4, 2,14]) scale([6,1,1]) sphere(1); 
+    translate([-7, 3, 2]) scale([8,1,1]) sphere(1);
+  }
+
+}
+
+module wheelBase() {
+supportSpread = 6;
+  difference() {
+    union() {
+      for (i=[-wheel_offset,wheel_offset]) {
+        hull() { // main wheel axle screw holder pair
+          translate([-wheel_dx, i,0]) wheelAxleBrace();
+          translate([-wheel_dx+10,(i<0)?i+11:i-11,10])
+            sphere(1,$fn=6);
+        }
+      }
+
+      // tension screw housing pair
+      translate([0,0,base_thickness/2]) rotate([0,90,0]) {
+        for (i=[-1,1]) {
+          hull() translate([0,i*boltSep,-20]) {
+            cylinder(r=5,h=41,$fn=36);
+            translate([5.43,0,16.5]) cube([.1,2,32],center=true);
+          }
+        }
+      }
+
+      // brace section for mobile mount 
+      hull() {
+        for(a=[-1,1]) translate([2,(boltSep+4)*a,base_thickness/2])
+          rotate([0,90,0])
+            intersection() {
+              rotate([0,0,22.5])
+                 cylinder(r=base_thickness/2+1,h=25,$fn=8);
+                 //cylinder(r=base_thickness/2/cos(22.5),h=23,$fn=8);
+              cube([base_thickness,base_thickness,80],center=true);
+            }
+        translate([-8,0,base_thickness]) cube([1,14,.1],center=true);
+      }
+
+      // brace between main fixed wheel axles
+      hull() for(i=[-wheel_offset,wheel_offset])
+        translate([-wheel_dx+1,i,6]) scale([1.5,.1,3]) sphere(2,$fn=36);
+
+      // extra bracing from belt catch to mobile mount rails
+      translate([0,-15,1])                 cableCatchBrace();
+      translate([0, 15,1]) mirror([0,1,0]) cableCatchBrace();
+
+      // brace under mount horn on non-mobile side.
+      // not structurally necessary, but allows us to print with
+      // less support material
+      hull() {
+        translate([-19,0,11]) scale([1,2,1]) cylinder(r=2,h=.1,$fn=36);
+        translate([-15,0,10.7]) scale([1,2,1]) cylinder(r=4.3,h=.1,$fn=48);
+        translate([-16.7,0,6]) sphere(1,$fn=10);
+      }
+      
+    }
+
+    // Adjustable tension screw holes
+    translate([0,0,base_thickness/2]) rotate([0,90,0]) {
+      for(i=[-boltSep,boltSep]) {
+        translate([0,i,-24]) {
+          cylinder(r=m3rad,h=60,$fn=13);
+          cylinder(r1=m3nutRad+.4, r2=m3nutRad-.2, h=7, $fn=6);
+        }
+      }
+    }
+  }
+}
+
+module wheelBaseHoles() {
+  for (a=[-wheel_offset,wheel_offset])
+    translate([-wheel_dx,a,base_thickness+1]) wheelAxleHole5(0);
+  translate([wheel_dx-1.5,0,0  ]) mobileWheelMount(.15); // dilated version for main slot
+  // raise supported ceiling a bit, since it is hard to clen supports
+  translate([wheel_dx+2.3,0,base_thickness-.7])
+     cube([22,2*(boltSep+2),2],center=true);
+}
+
+module frogCarriage() {
+  difference() {
+    union() {
+      translate([0,0,base_thickness-.4]) mirror([1,0,0]) carriage();
+      wheelBase();
+    }
+
+    wheelBaseHoles();
+
+    // extra clearance for extrusion rail
+    //#translate([-9, -30,-.1]) cube([18,60,1.5]);
+  }
+}
+
+use <support.scad>;
+
+module mobileMountSupportBlade() {
+  intersection () {
+    rotate([60,0,0]) cube([.4,3,6],center=true);
+    translate([-1,-2,0]) cube([1,6,3]);
+  }
+}
+module mobileMountSupport() {
+  for(a=[-3.9:4:10])
+    translate([a,-boltSep-4.3,0]) mobileMountSupportBlade();
+}
+
+
+
+//if (0)
+%translate([wheel_dx+33*1,0,0]) {
+   mobileWheelMount(0);
+   // support
+   color("Green") {
+     //translate([3,0,0])
+     mobileMountSupport();
+     mirror([0,1,0]) mobileMountSupport();
+   }
+}
+
+frogCarriage();
+
+// support structures
+//if(0) 
+color("Cyan") {
+  translate([ 22.3,0,base_thickness+.2])                 scale([0.5,0.6,0.7]) earBrace();
+  translate([-22.3,0,base_thickness+.2]) mirror([1,0,0]) scale([0.5,0.6,0.7]) earBrace();
+
+  // under horn.  Slightly different heights for mobile clearance
+  translate([19.5,0,0]) rotate([0,0,90]) supportPillar(0,0,base_thickness+.2,r=1,xscale=5);
+
+
+  for (i=[-1,1]) {
+    supportPillar(24*i,0,12.2,r=1.5);  // under horn earBrace()'s
+
+    // horn overhang
+    supportPillar(13.5 ,11.4*i,base_thickness+.2,r=1,xscale=6,rot=15*i);
+    supportPillar4(10.5  , 10.5  *i,5,4,base_thickness+.2);
+  }
+  supportPillar4(12.6,0,9,15,base_thickness+.2);
+  supportPillar4(12.6,0,5,11,base_thickness+.2);
+  supportPillar4(12.6,0,2, 7,base_thickness+.2);
+  supportPillar(-9.5,0,9,r=1.4,xscale=5,rot=90);
+  supportPillar(-5  ,0,8,r=1.3,xscale=5,rot=90);
+}
+
+use <endstop20v.scad>;
+// This carriage sits 1.8mm above extrusion
+%translate([0,-40,6-1.8]) rotate([0,180,0]) microswitchEndstop20v(0);
+
diff --git a/gamma28mount100x100.pl b/gamma28mount100x100.pl
new file mode 100755
index 0000000..18ce5bb
--- /dev/null
+++ b/gamma28mount100x100.pl
@@ -0,0 +1,54 @@
+#!/usr/bin/perl -w
+# $URL: svn+ssh://mrwhat@ssh.boim.com/home/mrwhat/svn/Walker/trunk/e20payload30_171x285.pl $
+# $Id: e20payload30_171x285.pl 417 2014-04-19 14:38:28Z mrwhat $
+
+require 'laserPartsUtil.pl';
+
+# get this from file name to make SURE it matches
+($wmm,$hmm) = &parseSizeFromFileName($0);
+print STDERR "$wmm x $hmm\n";
+&printLaserCutHeader($wmm,$hmm);
+
+
+# set up standard cart. coords with origin near LLC
+print "<g transform='translate(20,90) scale(1,-1)'>\n";
+&plotCircle(0,58.5  ,3,16);
+&plotCircle(31+35,12,3,16);
+print "<path d='";
+&drawArc('M',-5,4,4,-180,-90,15);
+&drawArc('L',35+31,12,12,-90,120,10);
+&drawArc('L',35+1.5,32.5,25,-40,-180,-8);
+&drawArc('L',0,58.5,9,0,180,10);
+print " Z'/>";
+
+print "<g transform='translate(0,52) rotate(-90)'>
+<desc>long side brace to glue on</desc>
+<path transform='translate(-5,45) rotate(-45)' d='M0,25
+l0,20 L45,0 l-20,0 Z'/>\n";
+
+print "\n<desc>Extra bracing for thin arm, flush with box</desc>
+<path transform='translate(26.8,60) rotate(-90)'
+d='M0,0 l10,10 l25,0 l10,-10'/>\n";
+print "</g></g>\n";
+
+print "\n<desc>Cut-out for gamma28 duct.
+Delete this for actual brace cut, but delete everything else to cut
+hole for duct on main box.</desc>
+<path transform='translate(40,20)' stroke='#009900'
+d='M0,0 l0,30 l42,0 l0,-30 Z'/>\n\n";
+
+print "\n<desc>Vent holes
+Delete this for actual brace cut, but delete everything else to cut
+vent holes in main box.</desc>\n";
+for ($x=10; $x < 70; $x+=18) {
+    for ($y=4; $y<=16; $y+=4) {
+	print "<path transform='translate($x,$y)' stroke='#009900' d='";
+	&drawArc('M', 0,0,1, 90,270,15);
+	&drawArc('L',13,0,1,-90, 90,15);
+	print " Z'/>\n";
+    }
+}
+
+
+print "\n\n</g></svg>\n"; # end of drawing
+
diff --git a/glassBedTab.scad b/glassBedTab.scad
new file mode 100644
index 0000000..5521876
--- /dev/null
+++ b/glassBedTab.scad
@@ -0,0 +1,49 @@
+// Glass print bed holder tab
+
+// ---- 250mm borosilicate plate from ultibots.
+//plateDiam = 9.84 * 25.4;
+//plateThick = 3.3;
+//tabHeight = 6.5;
+
+// ---- 9" springform pan base, norpro, tempered glass 
+plateDiam = 9.03 * 25.4;
+plateThick = 4.9;
+tabHeight = 8;
+
+
+tabWidth = 3;  // amount of tab that sits on top of glass
+
+
+m3threadRad = 2.88/2;
+m3HeadRad = 5.4/2;
+
+plateRad = plateDiam/2;
+
+// need bolt head 4.5mm above extrusion to use 8mm bolt
+counterSink = tabHeight-4.5;  // depth of bolt head countersink
+
+
+difference() {
+  scale([1.3,1.6,1]) cylinder(r=10,h=tabHeight,$fn=60);
+
+  // m3 bolt hole
+  translate([0,-9,-1]) {
+    cylinder(r=m3threadRad+0.3,h=11,$fn=17);
+    cylinder(r1=m3HeadRad+.4,r2=m3HeadRad+.15,h=1+counterSink,$fn=25);
+  }
+
+  translate([0,plateRad-tabWidth,tabHeight-plateThick+.2]) {
+     cylinder(r=plateRad,h=plateThick+.3,$fn=180);
+     translate([0,0,-tabHeight+plateThick-1])
+       cylinder(r=plateRad-tabWidth,h=plateThick+2,$fn=180);
+  }
+
+}
+
+%color("Cyan") { // support
+  translate([0,-9,0]) difference() {
+    cylinder(h=counterSink-.3,r=2.35,$fn=8);
+    translate([0,0,-1])
+      cylinder(h=6,r=2.2,$fn=8);
+  }
+}
\ No newline at end of file
diff --git a/glassBedTab10.scad b/glassBedTab10.scad
new file mode 100644
index 0000000..8b4191a
--- /dev/null
+++ b/glassBedTab10.scad
@@ -0,0 +1,37 @@
+// Glass print bed holder for 10" borosilicate plate
+// from ultibots.
+
+plateDiam = 9.84 * 25.4;
+plateThick = 3.3;
+
+m3threadRad = 2.88/2;
+m3HeadRad = 5.4/2;
+
+plateRad = plateDiam/2;
+
+tabHeight = 6.5;
+
+difference() {
+  scale([1.3,1.6,1]) cylinder(r=10,h=tabHeight,$fn=60);
+
+  // m3 bolt hole
+  translate([0,-9,-1]) {
+    cylinder(r=m3threadRad+0.3,h=11,$fn=11);
+    cylinder(r1=m3HeadRad+.35,r2=m3HeadRad+.1,h=1+3-.5,$fn=17);
+  }
+
+  translate([0,plateRad-4,tabHeight-plateThick+.2]) {
+     cylinder(r=plateRad,h=plateThick+.3,$fn=180);
+     translate([0,0,-tabHeight+plateThick-1])
+       cylinder(r=plateRad-3,h=plateThick+2,$fn=180);
+  }
+
+}
+
+color("Cyan") { // support
+  translate([0,-9,0]) difference() {
+    cylinder(h=2.2,r=2.35,$fn=8);
+    translate([0,0,-1])
+      cylinder(h=4,r=2.2,$fn=8);
+  }
+}
\ No newline at end of file
diff --git a/glass_frame.stl b/glass_frame.stl
deleted file mode 100644
index ed0efef..0000000
Binary files a/glass_frame.stl and /dev/null differ
diff --git a/glass_tab.stl b/glass_tab.stl
deleted file mode 100644
index 3edcc30..0000000
Binary files a/glass_tab.stl and /dev/null differ
diff --git a/hotEndProbeMount.scad b/hotEndProbeMount.scad
new file mode 100644
index 0000000..abdac8b
--- /dev/null
+++ b/hotEndProbeMount.scad
@@ -0,0 +1,26 @@
+use <needleProbe.scad>;
+
+ew = 16.1+.3;
+eh = 9.75+.2;
+mountPlateThickness=3;
+difference() {
+  union() {
+    hull() {
+      translate([0,0,5/2]) cube([19,13,5],center=true);
+      translate([0,18,0.5]) cube([8,1,1],center=true);
+    }
+    hull() {
+      translate([0,21.8,7.3]) cube([14.5,8,1.3],center=true);
+      translate([0,7,3]) cube([3,2,4],center=true);
+      translate([0,16,0.5]) cube([10,10,1],center=true);
+    }
+  }
+  translate([-ew/2,-eh/2,mountPlateThickness]) cube([ew,eh,5]);
+  translate([0,0,-1]) cylinder(r=2.94/2+.2,h=9,$fn=24);
+}
+
+%translate([0,9.8/2,12+mountPlateThickness]) { // Z offset to nozzle center
+  translate([0,25,0]) rotate([90,0,0]) cylinder(h=20,r=.2,$fn=4); // show where hot-end tip centerline is
+  rotate([-90,0,0]) cylinder(h=4.5,r2=0.3,r1=4,$fn=24);
+  translate([0,18,0]) rotate([90,0,0]) rotate([0,0,-60]) magnetMount(disk=2);
+}
diff --git a/hotEndRetainer.scad b/hotEndRetainer.scad
new file mode 100644
index 0000000..e5dc111
--- /dev/null
+++ b/hotEndRetainer.scad
@@ -0,0 +1,168 @@
+include <configuration.scad>;
+use <ChineseHotEnd.scad>;  // as altered for chinese J hot-end
+
+
+separation = 40;  // Distance between ball joint mounting faces.
+offset = 20;  // Same as DELTA_EFFECTOR_OFFSET in Marlin.
+mount_radius = 12.5;  // Hotend mounting screws, standard would be 25mm.
+hotend_radius = 8;  // Hole for the hotend (J-Head diameter is 16mm).
+push_fit_height = 4;  // Length of brass threaded into printed plastic.
+height = 8;
+cone_r1 = 2.5;
+cone_r2 = 14;
+
+//// dimensions of attachment groove in chineese knock-off J-head
+radGroove = 12.1/2;
+// groove width is 4.5.  Make a little thinner for "slop" and pad
+grooveWidth = 4.4;
+
+module nutCatcher() {
+  difference() {
+    cylinder(h=2.3,r1=4.6,r2=4,$fn=36);
+    // nuts are 5.5mm wide.  radius to corner is 5.5/2/.866=3.1755
+    translate([0,0,-.1]) cylinder(h=2.5,r1=3.08,r2=3.3,$fn=6);
+  }
+}
+
+// key piece of hot-end retainer, alone for building fan mount/duct
+module hotEndKey() {
+  difference() {
+    union() {
+      translate([0,11,grooveWidth/2]) cube([12-0.1,18,grooveWidth],center=true);
+      //%cylinder(r=offset-3, h=4.4, $fn=60);
+      translate([0, mount_radius, grooveWidth-0.1])
+	       nutCatcher();
+    }
+
+    translate([0,0,-.1]) cylinder(r=radGroove+.2,h=5,$fn=48); 
+
+    translate([0, mount_radius, 0])
+	     cylinder(r=m3_wide_radius, h=2*height, center=true, $fn=12);
+  }
+}
+
+module hotEndRetainer() {
+radGroove = 12.1/2;
+  difference() {
+    union() {
+      // groove width is 4.5.  Make a little thinner for "slop" and pad
+      cylinder(r=offset-3, h=4.4, $fn=60);
+
+      for (a = [0:60:359]) rotate([0, 0, a])
+        translate([0, mount_radius, 4.3])
+	       nutCatcher();
+    }
+
+    translate([0,0,-.1]) cylinder(r=radGroove+.2,h=5,$fn=48); 
+
+    for (a = [0:60:359]) rotate([0, 0, a]) {
+      translate([0, mount_radius, 0])
+	     cylinder(r=m3_wide_radius, h=2*height, center=true, $fn=12);
+    }
+    translate([ radGroove-.3,0,0]) cube([.3,20,5]);
+    translate([-radGroove-.2,0,0]) cube([.3,20,5]);
+  }
+}
+
+fanBoltSep = 32;  // distance between fan bolt centers
+/*
+module fanBoltReceivers() {
+  for(x=[-1,1]) { for(y=[-1,1]) {
+    translate(fanBoltSep*0.5*[x,y,0]) difference() {
+      cylinder(h=4,r=3.3,$fn=16);
+
+      // try to make holes tight enough to directly thread an M3 bolt
+      translate([0,0,-1]) cylinder(h=6,r=2.7/2,$fn=9);
+    }
+  }}
+}
+*/
+
+module fanMount40mm() {
+  union() {
+    // frame under outside edge of fan
+    translate([-22,-20,0]) difference() {
+      cube([40,40,4]);
+
+      // flatten circle edges for extra bracing
+      translate([20,20,1]) intersection() {
+        cylinder(r=19,h=10,$fn=48,center=true);
+        cube([35,35,8],center=true);
+      }
+
+      // notch in frame for bolt
+      translate([36,20,6]) rotate([0,90,0]) cylinder(h=4,r=6,$fn=9);
+
+      // don't bother with top of frame.  Will generate too much fill.
+      // may glue more ducting there later if necessary
+      translate([-1,7,-1]) cube([15,26,8]);
+
+      // fan bolt holes.
+      // make tight enough to directly thread an M3 bolt, no nut
+      translate([20,20,-1]) { for(x=[-1,1]) { for(y=[-1,1]) {
+        translate(fanBoltSep*0.5*[x,y,0]) 
+          cylinder(h=6,r=2.8/2,$fn=9);
+      }}}
+    }
+
+    // duct/redirection toward hot-end
+    translate([-22,0,5]) rotate([0,90,0]) scale([1.2,1,1]) difference() {
+      cylinder(h=42,r=20.5,$fn=48);
+      translate([ 0 ,0,-2]) cylinder(h=42,r=19,$fn=48);
+      translate([-22,0,-1]) cylinder(h=44,r=16,$fn=16);
+      translate([3.8,-22,-1]) cube([20,44,44]); // chop off stuff that intersects with fan
+      translate([-6,0,39]) scale([1,2,1]) cylinder(h=5,r=7,$fn=16); // chop off stuff that fills in drill holes
+      translate([-17,0,39]) scale([1,2,1]) cylinder(h=5,r=7,$fn=16);
+    }
+  }
+}
+
+module slottedDuct(h=40,r=17.3,thick=0.6) {
+  difference() {
+    cylinder(h=h,r=r,$fn=60);
+    translate([0,0, 3]) cylinder(h=h  ,r=r-thick,$fn=60);
+    translate([0,0,-1]) cylinder(h=h+2,r=r-2  ,$fn=24);
+    translate([0,10+1,h/2]) cube([12.4,20,h+2],center=true);
+
+    // extra vent to increase flow around top (cool part) of hot-end
+    translate([0,-15,20]) rotate([90,0,0]) scale([1,4,1]) cylinder(r=2,h=5,$fn=12);
+  }
+}
+
+module blowerKey() {
+blowOW=11; //Outer width of DX 322439 blower, Model4010S, 12v, 0.1A
+  difference() {
+    union() {
+      hotEndKey();
+      translate([0,19.3,11]) cube([blowOW+3,6,59],center=true);
+    }
+
+    translate([0,19.3,12]) {
+      translate([0,2,0]) cube([10.8,6,42.5],center=true);
+      translate([0,0,(42.5-25)/2-1]) cube([9.3,7,25],center=true);
+      translate([-1.8,-1,-26]) cube([7.2,5,5.7]);
+    }
+    translate([2,21,-20]) #cylinder(r=1,h=8 ,$fn=11);
+    translate([0,21, 30])  cylinder(r=1,h=15,$fn=11);
+    translate([0,21, 37])  cylinder(r=2,h=8,$fn=11);
+  }
+}
+
+//=====================================================================
+// Shift up and add a brim for easier printing at quelab
+union() {
+  hotEndRetainer();
+  slottedDuct();
+  translate([0,-18.5,fanBoltSep/2+5.5]) rotate([-90,90,0]) %fanMount40mm();
+
+  //color("Cyan") {
+  //  //%cylinder(h=.4,r=17.1,$fn=60);
+  //}
+}
+
+blowerKey();  // shows relation to main
+translate([30,0,0]) rotate([-90,0,0]) blowerKey(); // for printing
+
+%ChineseHotEnd();  // to show overlay
+//%translate([50,0,0]) fanMount();
+//%translate([0,22,0]) grooveRing(0);
\ No newline at end of file
diff --git a/hotEndSwitchMount.scad b/hotEndSwitchMount.scad
new file mode 100644
index 0000000..51ea434
--- /dev/null
+++ b/hotEndSwitchMount.scad
@@ -0,0 +1,32 @@
+use <nanoswitch.scad>;
+
+ew = 16.1+.3;
+eh = 9.75+.2;
+mountPlateThickness=3;
+difference() {
+  union() {
+    hull() {
+      translate([-9,-6,0]) cube([18,13,5]);
+      translate([-1.5,10,0.5]) cube([15,6,1],center=true);
+    }
+    hull() {
+      translate([-2.4,16,11.5]) cube([12,7,1.3],center=true);
+      //translate([-1,7,3]) scale([8,2,2]) sphere(1,$fn=12);
+      translate([0,7,3]) cube([6,2,4],center=true);
+      translate([-1,9,0.5]) cube([16,10,1],center=true);
+    }
+  }
+  //%translate([-ew/2,-eh/2,mountPlateThickness]) cube([ew,eh,5]);
+  translate([-ew/2,-eh/2,mountPlateThickness]) hull() {
+    translate( [ 0.1, 0.1,0]) cube([ew-0.2,eh-0.2,0.1]);
+    translate([-0.2,-0.2,3]) cube([ew+0.4,eh+0.4,0.1]);
+  }
+  translate([0,0,-1]) cylinder(r=2.94/2+.2,h=9,$fn=24);
+  translate([-2.4,15,0]) nanoswitchHoles();
+}
+
+%translate([0,9.8/2,12+mountPlateThickness]) { // Z offset to nozzle center
+  translate([0,20,0]) rotate([90,0,0]) cylinder(h=15,r=.2,$fn=4); // show where hot-end tip centerline is
+  rotate([-90,0,0]) cylinder(h=4.5,r2=0.3,r1=4,$fn=24);
+  translate([-2.4,15-9.8/2,.15-mountPlateThickness]) nanoswitch();
+}
diff --git a/hotend_fan.stl b/hotend_fan.stl
deleted file mode 100644
index 02dec72..0000000
Binary files a/hotend_fan.stl and /dev/null differ
diff --git a/laserPartsUtil.pl b/laserPartsUtil.pl
new file mode 100644
index 0000000..6166e81
--- /dev/null
+++ b/laserPartsUtil.pl
@@ -0,0 +1,197 @@
+# SVG drawing primitives
+
+$cutColor= "\#0000FF";
+$deg2rad = 0.01745329252;
+$endPart = "'></path></g>\n";  # endpath and location(translation) group to end each part
+
+sub printHeader() {
+    local ($w,$h) = @_;
+
+#always set scale to 10:1 pixels:unit.
+#This is convenient for looking with geeqie.  1:1 renders too blurry
+    #if ($preview) { $w *= 10; $h *= 10; }
+
+    # make the device scale 10* the virtual size in mm.
+    local $w10 = 10*$w;
+    local $h10 = 10*$h;
+
+# adding  viewport-fill=\"white\" attribute to <svg> does not seem to help...
+    print "<?xml version=\"1.0\" encoding=\"utf-8\"  standalone=\"no\"?>
+<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\"
+\"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">
+<svg width=\"$w10\" height=\"$h10\"
+viewBox=\"0 0 $w $h\"
+preserveAspectRatio=\"xMinYMin meet\"
+xmlns=\"http://www.w3.org/2000/svg\"
+xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n";
+}
+
+# takes full width of desired drawing area in mm.
+# draw fiducials (for non-preview) which are inset INSIDE this drawing area by 0.5mm
+# parameters should be ACTUAL drawing area OUTSIDE dimensions
+#    (Fiducials drawn barely INSIDE this box!)
+sub drawCornerFiducials() {
+    local ($w,$h) = (@_);
+
+    # should be in a mm scale drawing group before calling this function
+
+# try to set a "background" rectangle that renders better on image viewers as png
+#   (viewers don't have a background to show through under transparency)
+    print "
+<desc>background rectangle
+     *** delete this for production drawing ***</desc>
+<rect x=\"0\" y=\"0\" width=\"$w\" height=\"$h\" fill=\"#EEEECC\" fill-opacity=\"0.8\" stroke=\"none\"/>
+\n";
+
+# fiducial in magenta is ponoko code for light engraving
+
+    local ($xa,$x0,$xb) = ($w-1,$w-.5,$w);
+    local ($ya,$y0,$yb) = ($h-1,$h-.5,$h);
+
+    # print a little border
+    # for some unknown reason, this box seems to show up shifted by 0.5 units.
+    # crosses are as expected.  I have no idea why I need the extra translate()
+    print "\n<desc>Bounding box/warning strip
+        *** delete this for production drawing ***
+        I have no idea why it needs the extra translate() to line up</desc>\n";
+    print "<path transform='translate(0.5,0.5)' stroke-opacity='0.3' stroke='rgb(200,100,0)' stroke-width='1' d='M.5,.5 l0,$ya l$xa,0 l0,-$ya Z'/>\n";
+
+    # let fiducial be inset, 0.5mm inside drawing area
+    print "\n<desc>Corner crosses, centers inset 0.5mm, tips ON border</desc>\n";
+    print "<path stroke='#FF00FF' d='
+M0,0.5 l1,0 m-.5,-.5 l0,1
+M$x0,0 l0,1 m-.5,-.5 l1,0
+M$x0,$ya l0,1  m-.5,-.5 l1,0
+M.5,$ya l0,1  m-.5,-.5 l1,0'/>
+<!-- ====================================================================== Start Main Drawing -->\n";
+}
+
+####### Standard header/container fiducials for drawings to be converted to DXF for LaserCut
+sub printLaserCutHeader {
+    local ($wmm,$hmm) = @_;
+
+    &printHeader($wmm,$hmm);
+
+    print "
+<desc>Establish main drawing parameters
+      set stroke-width to 0.01 or 0.001 for production/DXF</desc>
+<g style=\"stroke:#FF0000; stroke-width:0.25;
+fill:none; stroke-linejoin:miter; stroke-linecap:butt\">\n";
+
+    &drawCornerFiducials($wmm,$hmm,$preview);
+}
+
+### Assuming that a file name is like *WxH.*, where W is drawing width, and H
+# is drawing height (usually mm, but could be pixels), parse these numbers from file name and use them.
+sub parseSizeFromFileName() {
+    local ($fNam) = @_;
+
+    local ($w,$h) = (384,384);
+    $_ = $fNam;
+    chomp;
+    s/^.*\///;
+#print STDERR "\n$_\n";
+    s/\..*$//;
+#print STDERR "\n$_\n";
+    local @a = split /x/;
+#print STDERR "$#a\n";
+print STDERR "$a[$#a-1]x";
+print STDERR "$a[$#a]\n";
+    if ($#a < 1) { return($w,$h); } 
+    $h = $a[$#a];
+    $_ = $a[$#a-1];
+    @a = split /[a-zA-Z_\+\-\s\.]/;
+    if ($#a < 0) { return($w,$h); } 
+    $w = $a[$#a];
+print STDERR "$w x $h\n";
+    return($w,$h);
+}
+
+sub startPart() {
+    local ($cx, $cy, $rot) = (@_,0);
+
+    print "<g transform=\"translate($cx,$cy)"; # origin for link drawing
+    print " rotate($rot)" if ($rot != 0); # optional rotation
+    print "\">\n";
+    # moved to a setting for the whole cut group:
+    #print "<path stroke='$cutColor' d='"; # start path definition
+    print "<path d='"; # start path definition
+}
+
+sub drawCircle() { # centerX, centerY, radius, numberOfFacets
+    local ($x0,$y0,$r,$nf) = (@_,9);  # default to 9 facets
+    &drawArc('M',$x0,$y0,$r,0,360,360/$nf);
+}
+sub plotCircle() { # centerX, centerY, radius, numberOfFacets
+    local ($x0,$y0,$r,$nf) = (@_,9);  # default to 9 facets
+    &startPart($x0,$y0);
+    &drawCircle(0,0,$r,$nf);
+    print $endPart;
+}
+
+sub drawArc() {
+  local ($startCode,$cx,$cy,$r,$startDeg,$stopDeg,$step) = @_;
+
+  local $a=$startDeg;
+  local $ar = $a * $deg2rad;
+  local $x = $cx + $r * cos($ar);
+  local $y = $cy + $r * sin($ar);
+  printf("\n %s%.2f,%.2f",$startCode,$x,$y);
+  $a += $step;
+  while( ($step < 0) ? ($a > $stopDeg) : ($a < $stopDeg) ) {
+      $ar = $a * $deg2rad;
+      $x = $cx + $r * cos($ar);
+      $y = $cy + $r * sin($ar);
+      printf(" L%.2f,%.2f",$x,$y);
+      $a += $step;
+  }
+  $ar = $stopDeg * $deg2rad;
+  $x = $cx + $r * cos($ar);
+  $y = $cy + $r * sin($ar);
+  printf(" L%.2f,%.2f\n",$x,$y);
+}
+
+sub raspPiMountHoles() {
+    local ($x0,$y0,$rot) = (@_,0,0,0);
+
+    local ($w,$h) = (85,56);  # total board width and height
+    local $hr = 2.9/2;  # hole radius
+
+    &startPart($x0,$y0,$rot);
+    #$hr = $rad4;
+    local $hrd = 12;
+    &drawCircle( 5,$h-12.5,$hr,$hrd);
+    &drawCircle($w-25.5,18,$hr,$hrd);
+    print $endPart;
+}
+
+sub ArduinoUnoMountHoles() {
+    local ($x0,$y0,$rot) = (@_,0,0,0);
+
+    &startPart($x0,$y0,$rot);
+    local $hrd = 12;
+    local $hr = $rad4 + $fuzz;  # override global, which may not be set
+    &drawCircle(14         ,53.3-2.5              ,$hr,$hrd);
+    &drawCircle(14+1.3     ,53.3-2.5-5.1-27.9-15.2,$hr,$hrd);
+    &drawCircle(14+1.3+50.8,53.3-2.5-5.1          ,$hr,$hrd);
+    &drawCircle(14+1.3+50.8,53.3-2.5-5.1-27.9     ,$hr,$hrd);
+    print $endPart;
+}
+
+# origin is URC looking down from top
+sub ArduinoMegaMountHoles() {
+    local ($x0,$y0,$rot) = (@_,0,0,0);
+
+    &startPart($x0,$y0,$rot);
+    local $hrd = 12;
+    local $hr = 3.2/2;  # Arduino holes are diameter 3.2mm
+    &drawCircle(14              ,     -2.5          ,$hr,$hrd);
+    &drawCircle(14+1.3          ,-53.3+2.5          ,$hr,$hrd);
+    &drawCircle(14+1.3+50.8     ,-53.3+2.5+15.2     ,$hr,$hrd);
+    &drawCircle(14+1.3+50.8     ,-53.3+2.5+15.2+27.9,$hr,$hrd);
+    &drawCircle(14+1.3+50.8+24.1,-53.3+2.5          ,$hr,$hrd);
+    &drawCircle(101.6-5         ,     -2.5          ,$hr,$hrd);
+    print $endPart;
+}
+
+1;
diff --git a/logotype.stl b/logotype.stl
deleted file mode 100644
index df1bb23..0000000
Binary files a/logotype.stl and /dev/null differ
diff --git a/longAllMetalBowdenHotEnd.scad b/longAllMetalBowdenHotEnd.scad
new file mode 100644
index 0000000..04e4af0
--- /dev/null
+++ b/longAllMetalBowdenHotEnd.scad
@@ -0,0 +1,35 @@
+
+
+module hotBlock() {
+bevilRad=.8;
+br=16.15/2 - bevilRad;
+  translate([0,0,-2.85]) cylinder(r=7.94/2/cos(30),h=2.85,$fn=6);
+  //%translate([0,0,11.9/2]) cube([16.15,16.15,11.9],center=true);
+  difference() {
+    translate([0,3.85,0]) hull() for(a=[-1,1]) for(b=[-1,1])
+      translate([a*br,b*br,0]) cylinder(r=bevilRad,h=11.9,$fn=16);
+
+    translate([0,3.85+16.15/2-6.25/2-1.6,3.6+6.25/2]) rotate([0,90,0])
+      #cylinder(r=6.25/2,h=17,$fn=36,center=true);
+  }
+  translate([0,0,-5]) cylinder(r1=.5,r2=2,h=2.3,$fn=36);
+  
+}
+
+module metalHotEnd() {
+  union() {
+    translate([0,0,-12  ]) cylinder(r=12/2,h=50  ,$fn=60);
+    translate([0,0,-12  ]) cylinder(r=16/2,h=3.7 ,$fn=60);
+    translate([0,0,-2.75]) cylinder(r=16/2,h=2.75,$fn=60);
+    translate([0,0, 2.45]) cylinder(r=16/2,h=1,$fn=60);
+    for (a=[0:9])
+      translate([0,0,6.2+a*(2.2+1.2)]) cylinder(r=24.9/2,h=1.2,$fn=60);
+  }
+
+  translate([0,0,-12-7]) cylinder(r=(9.86/2)/cos(30),h=6.4,$fn=6);
+  translate([0,0,38+11.9+2.9]) rotate([180,0,0]) hotBlock();
+}
+
+metalHotEnd();
+
+//hotBlock();
\ No newline at end of file
diff --git a/m5_internal.stl b/m5_internal.stl
deleted file mode 100644
index 9dd5987..0000000
Binary files a/m5_internal.stl and /dev/null differ
diff --git a/microswitch.scad b/microswitch.scad
index 3df94ec..4ad48c9 100644
--- a/microswitch.scad
+++ b/microswitch.scad
@@ -1,6 +1,13 @@
 // Don't print this file, purchase real micro switches
 // e.g. Honeywell ZM10B10A01 or OMRON SS-5 or similar.
 
+module microswitchHoles() {
+  for (x = [-9.5/2, 9.5/2]) {
+    translate([x, 0, 0]) rotate([90, 0, 0])
+      cylinder(r=2.5/2, h=20, center=true, $fn=12);
+  }
+}
+
 module microswitch() {
   difference() {
     union() {
@@ -13,11 +20,44 @@ module microswitch() {
           cube([0.6, 3.2, 13], center=true);
       }
     }
-    for (x = [-9.5/2, 9.5/2]) {
-      translate([x, 0, 0]) rotate([90, 0, 0])
-        cylinder(r=2.5/2, h=20, center=true, $fn=12);
+    microswitchHoles();
+  }
+}
+
+module microswitchGuide() {
+  intersection() {
+    difference() {
+      hull() {
+        translate([-6,0,0]) cylinder(r=4,h=2,$fn=24);
+        translate([ 6,0,0]) cylinder(r=4,h=2,$fn=24);
+        translate([ 2.4,8,0]) scale([2,1,1]) cylinder(r=3,h=2,$fn=36);
+      }
+      translate([0,0,-1]) rotate([-90,0,0]) microswitchHoles();
+    }
+    translate([2.4,8,-1]) microswitchGuideSlot();
+  }
+}
+
+// little slot to help glide probe handle on top of switch
+module microswitchGuideSlot() {
+  difference() {
+    union() {
+      translate([-4.6,0.5,0]) cylinder(h=4,r=4,$fn=36);
+      translate([ 4.6,0.5,0]) cylinder(h=4,r=4,$fn=36);
+      hull() {
+        translate([-15,-13,0]) cube([25,1,4]);
+        translate([-11, -1,0]) cube([18,1,4]);
+      }
     }
+    cylinder(h=15,r=.6,$fn=18,center=true);
   }
 }
 
-microswitch();
+
+%microswitch();
+
+translate([0,-20,-1]) {
+   rotate([-90,0,0]) %microswitch();
+   //projection(cut=true)
+     microswitchGuide();
+}
\ No newline at end of file
diff --git a/modularProbePost.scad b/modularProbePost.scad
new file mode 100644
index 0000000..1f7d62c
--- /dev/null
+++ b/modularProbePost.scad
@@ -0,0 +1,170 @@
+include <configuration.scad>;
+
+height = 26;
+height2 = 26;
+tunnel = 2.4;
+face_offset = 4;
+
+module nanoswitchHoles() {
+   translate([ 6.5/2,0,-15+13]) cylinder(h=22,r=1,$fn=16);
+   translate([-6.5/2,0,-15]) cylinder(h=22,r=1,$fn=16);
+}
+
+module nanoswitch() {
+  difference() {
+      translate([-12.8/2,-1,0]) cube([12.8,6.2,5.75]);
+      translate([0,0,-1]) nanoswitchHoles();
+    }
+  #translate([12.8/2-4,6.2-1,1]) cylinder(h=5.75-2,r=0.45,$fn=16);
+}
+
+// little slot to help glide probe handle on top of switch
+module guideSlot() {
+  difference() {
+    union() {
+      translate([-2.6,0,0]) scale([1,2,1]) cylinder(h=4,r=2,$fn=36);
+      translate([ 2.6,0,0]) scale([1,2,1]) cylinder(h=4,r=2,$fn=36);
+      hull() {
+        translate([-11,-10,0]) cube([18,1,4]);
+        translate([-9,-1,0]) cube([15,1,4]);
+      }
+      translate([-4.5,0,2]) cube([6,4,4],center=true);
+    }
+  cylinder(h=5,r=.6,$fn=18);
+  }
+}
+
+module nanoswitchGuide() {
+  //%translate([-12.8/2,-1,0]) cube([12.8,6.2,5.75]);
+  //%translate([12.8/2-4,6.2-1,1]) cylinder(h=5.75-2,r=0.45,$fn=16);
+  intersection() {
+    difference() {
+      hull() {
+        translate([-4,0,0]) cylinder(r=3,h=2,$fn=24);
+        translate([ 4,0,0]) cylinder(r=3,h=2,$fn=24);
+        translate([ 2.4,6,0]) scale([2,1,1]) cylinder(r=2,h=2,$fn=36);
+      }
+      translate([0,0,-1]) nanoswitchHoles();
+    }
+    translate([2.4,5.5,-1]) guideSlot();
+  }
+}
+
+module hotEndHullProxy() {
+  hull() {
+    translate([0,0,1]) cylinder(r=3,h=17,$fn=24);
+    cylinder(r=9,h=13,$fn=6);
+  }
+}
+
+module foot() {
+  difference() {
+    rotate([0,0,-60]) hull() {
+      translate([12.5,0,0]) cylinder(r=5, h=4, $fn=24);
+      translate([1,-3,0]) scale([1,2,1]) cylinder(r=1,h=12,$fn=9);
+    }
+    translate([12.5, 0, 0]) {
+      for (a = [60:120:359]) {
+            rotate([0, 0, a]) translate([-12.5, 0, 0]) {
+          cylinder(r=m3_wide_radius, h=20, center=true, $fn=12);
+          translate([0,0,2.5]) cylinder(r1=3.05, r2=3.5, h=10, $fn=6);
+      }}
+    }
+  }
+}
+
+// main hole centered at (0,0).
+module retractable() {
+  difference() {
+    union() {
+      cylinder(r=6, h=height, $fn=32);
+      translate([-6,-6,0]) cube([12,  6,   height]);
+      hull() {
+        translate([-6,-4,0]) cube([2,4,height]);
+        translate([-2,2,15]) cylinder(r=3,h=4,$fn=16);
+        translate([-8+4,-2,0]) rotate([0,0,-50]) scale([1.5,2,1]) cylinder(r=2,h=18,$fn=24);
+      }
+      // extra wide for switch sticking out
+      hull() {
+        translate([6,-2,0]) rotate([0,0,-50]) scale([4,3,1]) cylinder(r=1,h=9,$fn=24);
+        translate([3,-2,15]) sphere(1);
+      }
+
+      // Feet for vertical M3 screw attachment.
+      rotate([0, 0, 90]) {
+        foot();
+        scale([1, -1, 1]) foot();
+      }
+
+    }
+
+    // central drill hole
+    cylinder(r=tunnel/2+extra_radius, h=3*height, center=true, $fn=21);
+
+    // main probe handle slot
+    translate([-(tunnel-0.5)/2, -7, 12]) hull() {
+      translate([0,0,3])  cube([tunnel-0.5  ,7,15]);
+      translate([.3,0,0]) cube([tunnel-1.025,7,1]);
+    }
+
+    // retracted probe catch ledge
+    hull() {
+      translate([tunnel/2, 0, 21]) rotate([0, 0,-150]) {
+        translate([0,2,1]) cube([tunnel,8,9]);
+        rotate([0,-10,0])  cube([tunnel,7,2]);
+      }
+      translate([0,0,21])cylinder(r=tunnel/2,h=15,$fn=18);
+    }
+
+    // Safety needle spring.
+    translate([-4.5, 0, height-11]) rotate([90, 0, 0])
+      translate([0,0,-8]) cylinder(r=1, h=20, $fn=12);
+    translate([-4, 0, height-2]) rotate([90, 0, 0])
+      translate([0,0,-2]) cylinder(r=1/2, h=20, $fn=12);
+    
+    // Flat front face.
+    translate([0, -face_offset-10, height/2]) cube([30, 20, 2*height], center=true);
+
+    // make sure we clear the hot-end hull on top
+    translate([0,12.5,-1]) hotEndHullProxy();
+
+    // Sub-miniature micro switch.
+    translate([-2.5, -face_offset, 5]) {
+      mirror([1,0,0]) translate([-5,0,1.7]) rotate([90,0,0]) { 
+        %nanoswitch();
+        nanoswitchHoles();
+      }
+    }
+
+    // bore out a larger hole to hold bowden tube for lower-friction probe guide
+    translate([0,0,-.02]) cylinder(h=12-2,r=3.95/2+.2,$fn=36);
+
+  }
+}
+
+// put solid layer below holes for quelab printer
+//union(){
+//  translate([0,0,0.15])
+   // retractable();
+//  color("Cyan") {
+//    hull() {
+//      translate([-11,-4.5,0]) cube([7,10,.3]);
+//      translate([-11,6.5,0]) cylinder(h=.3,r=5.5,$fn=16);
+//    }
+//    hull() {
+//      translate([4,-4.5,0]) cube([2,10,.3]);
+//      translate([ 11,6.5,0]) cylinder(h=.3,r=5.5,$fn=16);
+//    }
+//    translate([-4.5,-4.5,0]) cube([9,10,.3]);
+//  }
+//}
+
+// show in relation to effector head :
+//use <effectorC.scad>;
+//%translate([0,12.5,-4]) scale([1.02,1.02,1]) effector();
+
+// draw a probe handle guide plate, to be converted to DXF for laser cut
+translate([0,-20,0]) {
+  %translate([0,0,-5.75]) nanoswitch();
+  projection(cut=true) {translate([0,0,-2]) nanoswitchGuide();}
+}
diff --git a/motorVertex.scad b/motorVertex.scad
new file mode 100644
index 0000000..c9a462f
--- /dev/null
+++ b/motorVertex.scad
@@ -0,0 +1,32 @@
+// vertexC for use with OpenBuilds v-slot 2mm extrusion towers,
+// 15mm extrusion braces, and nema17 motors
+
+use <vertexC.scad>;
+use <nema17.scad>;
+
+difference() {
+  vertexC(45,0.1);
+  translate([0,48,45/2]) rotate([90,0,0]) {
+    nema17holes();
+    //translate([0,0,2])%nema17();
+  }
+}
+
+// support
+use <support.scad>;
+
+color("Cyan") {
+  for(a=[-1,1]) {
+    supportPillar(19.2*a,-5.5,4.4);
+    translate([15.8*a,0, 0  ]) rotate([0,0,-30*a]) zigZag(66,-2*a,6.2,2);
+    translate([15.8*a,0, 9.3]) rotate([0,0,-30*a]) zigZag(66,-2*a,5.5,2);
+    translate([15.8*a,0,30.6]) rotate([0,0,-30*a]) zigZag(66,-2*a,5.6,2);
+  }
+  for(z=[5,45-10]) {
+    translate([-22.5,-6.6,z]) supportPillar4(0,0,3,2,5.3, 30);
+    translate([ 25.5,-6.6,z]) supportPillar4(0,0,3,2,5.3,-30);
+  }
+  for(z=[7.1,30.1]) translate([ 1,-17,z]) supportPillar4(0,0,2  ,4,8);
+  for(z=[9.1,32.2]) translate([.8,-10,z]) supportPillar4(0,0,1.6,4,4);
+  translate([0,44,13]) supportPillar(0,0,21,r=1.2,xscale=7);
+}
diff --git a/nanoswitch.scad b/nanoswitch.scad
new file mode 100644
index 0000000..d227be9
--- /dev/null
+++ b/nanoswitch.scad
@@ -0,0 +1,45 @@
+module nanoswitchHoles() {
+   translate([ 6.5/2,0,-15+13]) cylinder(h=33,r=1+.05,$fn=16);
+   translate([-6.5/2,0,-15   ]) cylinder(h=33,r=1+.05,$fn=16);
+}
+
+module nanoswitch() {
+  difference() {
+      translate([-12.8/2,-1,0]) cube([12.8,6.2,5.75]);
+      translate([0,0,-1]) nanoswitchHoles();
+    }
+  #translate([12.8/2-4,6.2-1,1]) cylinder(h=5.75-2,r=0.45,$fn=16);
+}
+
+// little slot to help glide probe handle on top of switch
+module guideSlot() {
+  difference() {
+    union() {
+      translate([-2.75,0,0]) scale([1,2,1]) cylinder(h=4,r=2,$fn=36);
+      translate([ 2.75,0,0]) scale([1,2,1]) cylinder(h=4,r=2,$fn=36);
+      hull() {
+        translate([-11,-10,0]) cube([18,1,4]);
+        translate([-9,-1,0]) cube([15,1,4]);
+      }
+      translate([-4.5,0,2]) cube([6,4,4],center=true);
+    }
+  cylinder(h=5,r=.75,$fn=18);
+  }
+}
+
+module nanoswitchGuide() {
+  intersection() {
+    difference() {
+      hull() {
+        translate([-4,0,0]) cylinder(r=3,h=2,$fn=24);
+        translate([ 4,0,0]) cylinder(r=3,h=2,$fn=24);
+        translate([ 2.4,6,0]) scale([2,1,1]) cylinder(r=2,h=2,$fn=36);
+      }
+      translate([0,0,-1]) nanoswitchHoles();
+    }
+    translate([2.4,5.2,-1]) guideSlot();
+  }
+}
+
+%translate([0,0,-5.75]) nanoswitch();
+projection(cut=true) {translate([0,0,-2]) nanoswitchGuide();}
diff --git a/needleProbe.scad b/needleProbe.scad
new file mode 100644
index 0000000..c56ab9f
--- /dev/null
+++ b/needleProbe.scad
@@ -0,0 +1,119 @@
+// sketch for low-impact surface probe switch
+// Aaron Birenboim   06sep14
+
+magRad=6;  // radius of magnet group
+
+module magnetGroup(fuzz=0,disk=0) {
+// not sure which orientation is better, try both?
+diskMagnetRot = (disk>1)?[90,0,0]:[0,90,0];
+ for(i=[-120,0,120]) rotate([0,0,i]) translate([0,-magRad,-0.6])
+   if (disk) rotate(diskMagnetRot)
+     cylinder(h=1+fuzz*1.1,r=1.5+fuzz,$fn=36,center=true);
+   else
+     sphere(2.94/2+fuzz,$fn=36);   // 3mm bucky balls
+}
+
+module magnetMount(notional=false,disk=false,fuzz=0) {
+  // magnets for contacts and alignment
+  if (notional) color([0,0.4,0.8]) magnetGroup(disk=disk);
+
+  // magnet base
+  difference() {
+      translate([0,0,-3]) triPlate(3+7,8+magRad,13.5+magRad);
+      triPlate(10,6+magRad,11.5+magRad);
+
+    // skip this for actual printed model... 
+    //   this is just to see insides easier for display
+    if (notional)
+      translate([0,0,0.4]) cylinder(r=7+magRad,h=10,$fn=6);
+    else // hollow out for magnet spheres
+      magnetGroup(disk=disk,fuzz=fuzz);
+
+    translate([0,0,-4]) cylinder(r=.6+fuzz*1.5,h=5,$fn=9);
+
+    // drill hole for magnet contact wire
+    translate([0,-magRad-.3,0]) rotate([90,0,0])
+      rotate([0,0,-30]) cylinder(r=0.8,h=6,$fn=3);
+
+  }
+}
+
+module pinHead() {
+    union() {  // head
+      intersection() {
+        translate([0,0,-1]) cube([2,2,2],center=true);
+        scale([0.8,0.8,0.4]) sphere(1,$fn=36);
+      }
+
+    translate([0,0,-0.05]) cylinder(r=.32,h=10,$fn=24); // shaft
+  }
+}
+
+module probeMount(notional=false,fuzz=0) {
+  intersection() {  // main probe mount plate
+    translate([0,0,1]) cube([20,20,3],center=true);  // cut off pin shafts above
+
+    union() {
+      if (notional) for(i=[-120,0,120]) rotate([0,0,i])
+        translate([0,-magRad,-.05]) color([.5,.5,.6]) pinHead();
+
+      difference() {
+        //triPlate(1.5);  // main plate, fiberglass plastic, like PCB
+        triPlate(1.5,4.5+magRad,10+magRad);  // main plate, fiberglass plastic, like PCB
+
+        for(i=[-120,0,120]) rotate([0,0,i])  // pin holes
+          translate([0,-magRad,-1]) cylinder(r=0.4+fuzz,h=5,$fn=8);
+        translate([0,0,-1]) cylinder(r=0.4+fuzz,h=5,$fn=8);
+      }
+    }
+  }
+
+  if (notional) { // show probe pin for notional drawing
+    translate([0,0,1.6])mirror([0,0,1]) color([.3,.3,.5]) pinHead();  // main probe
+    translate([0,0,-8]) scale([1,1,2]) sphere(0.4,$fn=36);
+  }
+}
+
+module triPlate(h=2,r1=8,r2=10) {
+  rotate([0,0,30]) intersection() {
+    cylinder(r=r1,h=h,$fn=3);
+    translate([0,0,-0.1]) rotate([0,0,60]) cylinder(r=r2,h=h+0.2,$fn=3);
+  }
+}
+
+%if(1) { // show assembled notional view
+  /////////// main, in-place view
+  magnetMount(1,disk=0);
+  translate ([0,0,3]) probeMount(1);
+
+  // case can be 3D printed or machined
+  if(0) %translate([0,0,-4]) difference() {
+    cylinder(r=7,h=10,$fn=60);
+    translate([0,0,2]) cylinder(r=5.5,h=9,$fn=60);
+  }
+
+  color([.8,.4,.4]) { // wires
+    translate([0,-8,0.2]) cube([0.5,10,0.5],center=true);
+    rotate([60,0,60]) translate([0,10,-0.5]) cube([0.5,10,0.5],center=true);
+    translate([0,-3,3.5]) rotate([0,0,-30]) cube([0.5,5.5,0.5]);
+    translate([0,3,0.2]) cube([5.5,0.5,0.5],center=true);
+  }
+} // end of assembly view
+
+// parts to be fabricated
+translate([0,20, 0])
+  //magnetMount(fuzz=0.25,disk=0);
+  magnetMount(fuzz=0.4,disk=2);
+
+%translate([20,0,-1]) probeMount(fuzz=0.4);
+%translate([-20,0,-1]) { // cap
+  difference() {
+    triPlate(3,7.5+magRad,13+magRad);
+
+    translate([0,0,2]) difference() {
+      cylinder(r=14,h=4,$fn=6);
+      translate([0,0,-1]) triPlate(6,6+magRad-0.3,11.5+magRad-0.3);
+    }
+    translate([0,0,-1]) cylinder(r=0.6,h=6,$fn=6); // pass-trough for probe plate contact
+  }
+}
diff --git a/nema17.scad b/nema17.scad
index 58fa3c5..5c28713 100644
--- a/nema17.scad
+++ b/nema17.scad
@@ -18,4 +18,14 @@ module nema17() {
   }
 }
 
+module nema17holes() {
+  cylinder(r=11+1, h=4+5, $fn=48);
+  cylinder(r=2.5+.2, h=25, $fn=36);
+  for (a = [0:90:359]) {
+    rotate([0, 0, a]) translate([15.5, 15.5, 0])
+      cylinder(r=2.94/2+.2, h=10, $fn=11);
+  }
+}
+
 nema17();
+%nema17holes();
\ No newline at end of file
diff --git a/plate_1x.scad b/plate_1x.scad
deleted file mode 100644
index bbe067e..0000000
--- a/plate_1x.scad
+++ /dev/null
@@ -1,15 +0,0 @@
-include <configuration.scad>;
-
-use <effector.scad>;
-use <retractable.scad>;
-use <power_supply.scad>;
-use <extruder.scad>;
-
-% translate([0, 0, -3]) cylinder(r=85, h=3);
-translate([0, 30, 0]) union() {
-  translate([0, 0, 4]) effector();
-  translate([0, -30, 0]) power_supply();
-  translate([0, -42, 0]) rotate([0, 0, 180]) power_supply();
-  translate([-20, -65, 0]) rotate([0, 0, 45]) retractable();
-  translate([-8, -47, 0]) extruder();
-}
diff --git a/plate_1x.stl b/plate_1x.stl
deleted file mode 100644
index 0862e15..0000000
Binary files a/plate_1x.stl and /dev/null differ
diff --git a/plate_3x.scad b/plate_3x.scad
deleted file mode 100644
index a93e055..0000000
--- a/plate_3x.scad
+++ /dev/null
@@ -1,17 +0,0 @@
-include <configuration.scad>;
-
-use <frame_motor.scad>;
-use <frame_top.scad>;
-use <carriage.scad>;
-use <endstop.scad>;
-use <glass_tab.scad>;
-
-% translate([0, 0, -3]) cylinder(r=85, h=3);
-union() {
-  translate([-15, -55, 22.5]) frame_motor();
-  translate([15, 55, 7.5]) rotate([0, 0, 180]) frame_top();
-  translate([-40, 30, 0]) rotate([0, 0, -30]) carriage();
-  translate([0, 0, 7.5]) endstop();
-  translate([-15, -30, 7.5]) endstop();
-  translate([45, -20, thickness/2]) rotate([0, 0, 150]) glass_tab();
-}
diff --git a/plate_3x.stl b/plate_3x.stl
deleted file mode 100644
index b1cb117..0000000
Binary files a/plate_3x.stl and /dev/null differ
diff --git a/power_supply.stl b/power_supply.stl
deleted file mode 100644
index be4ec48..0000000
Binary files a/power_supply.stl and /dev/null differ
diff --git a/probePost.scad b/probePost.scad
new file mode 100644
index 0000000..e2bb3b5
--- /dev/null
+++ b/probePost.scad
@@ -0,0 +1,102 @@
+include <configuration.scad>;
+
+height = 26;
+height2 = 26;
+tunnel = 2.4;
+face_offset = 4;
+
+module nanoswitchHoles() {
+   translate([ 6.5/2,0,-15]) cylinder(h=22,r=1,$fn=16);
+   translate([-6.5/2,0,-15]) cylinder(h=22,r=1,$fn=16);
+}
+
+module nanoswitch() {
+  difference() {
+      translate([-12.8/2,-1,0]) cube([12.8,6.2,5.75]);
+      translate([0,0,-1]) nanoswitchHoles();
+    }
+  #translate([12.8/2-4,6.2-1,1]) cylinder(h=5.75-2,r=0.45,$fn=16);
+}
+
+module hotEndHullProxy() {
+  hull() {
+    translate([0,0,1]) cylinder(r=3,h=17,$fn=24);
+    cylinder(r=9,h=13,$fn=6);
+  }
+}
+
+// main hole centered at (0,0).  Bottom extends -1 in the Z direction, for
+// clean unions with support structure.  Bottom intended to be at z=0 plane
+module retractable() {
+  difference() {
+    union() {
+      translate([ 0, 0,-1]) cylinder(r=6, h=height+1, $fn=32);
+      translate([-6,-6,-1]) cube([12,  6,   height+1]);
+      hull() {
+        translate([-6,-4,-1]) cube([2,4,height+1]);
+        translate([-2,2,15]) cylinder(r=3,h=4,$fn=16);
+        translate([-8+4,-2,-1]) rotate([0,0,-50]) scale([1.5,2,1]) cylinder(r=2,h=18,$fn=24);
+      }
+    }
+
+    // central drill hole
+    cylinder(r=tunnel/2+extra_radius, h=3*height, center=true, $fn=21);
+
+    // main probe handle slot
+    translate([-(tunnel-0.5)/2, -7, 12]) hull() {
+      translate([0,0,3])  cube([tunnel-0.5  ,7,15]);
+      translate([.3,0,0]) cube([tunnel-1.025,7,1]);
+    }
+
+    // retracted probe catch ledge
+    hull() {
+      translate([tunnel/2, 0, 21]) rotate([0, 0,-150]) {
+        translate([0,2,1]) cube([tunnel,8,9]);
+        rotate([0,-10,0])  cube([tunnel,7,2]);
+      }
+      translate([0,0,21])cylinder(r=tunnel/2,h=15,$fn=18);
+    }
+
+    // Safety needle spring.
+    translate([-4.5, 0, height-11]) rotate([90, 0, 0])
+      translate([0,0,-8]) cylinder(r=2.5/2, h=20, $fn=12);
+    translate([-4, 0, height-2]) rotate([90, 0, 0])
+      translate([0,0,-2]) cylinder(r=1/2, h=20, $fn=12);
+    
+    // Flat front face.
+    translate([0, -face_offset-10, height/2]) cube([30, 20, 2*height], center=true);
+
+    // make sure we clear the hot-end hull on top
+    //translate([0,12.5,-1]) hotEndHullProxy();
+
+    // Sub-miniature micro switch.
+    translate([-2.5+2, -face_offset, 5]) {
+      translate([0,0,1]) rotate([90,0,0]) { 
+        %nanoswitch();
+        nanoswitchHoles();
+      }
+    }
+  }
+}
+
+// put solid layer below holes for quelab printer
+//union(){
+//  translate([0,0,0.15])
+    retractable();
+//  color("Cyan") {
+//    hull() {
+//      translate([-11,-4.5,0]) cube([7,10,.3]);
+//      translate([-11,6.5,0]) cylinder(h=.3,r=5.5,$fn=16);
+//    }
+//    hull() {
+//      translate([4,-4.5,0]) cube([2,10,.3]);
+//      translate([ 11,6.5,0]) cylinder(h=.3,r=5.5,$fn=16);
+//    }
+//    translate([-4.5,-4.5,0]) cube([9,10,.3]);
+//  }
+//}
+
+// show in relation to effector head :
+//use <effectorC.scad>;
+//%translate([0,12.5,-4]) scale([1.02,1.02,1]) effector();
+
diff --git a/pulleyHolder.scad b/pulleyHolder.scad
new file mode 100644
index 0000000..b486891
--- /dev/null
+++ b/pulleyHolder.scad
@@ -0,0 +1,73 @@
+boltSep = 12;
+baseRad = 5;
+m3rad = 2.94/2 + .1;
+baseHeight = 10;
+
+module boltHolder() {
+  scale([.9,1.1,1]) hull() {
+    cylinder(r=baseRad,h=baseHeight,$fn=45);
+    translate([0,0,baseHeight+1.5]) scale([1.3,1,1]) cylinder(r=3.5,h=1,$fn=45);
+  }
+}
+
+module nutHole() {
+  union() {
+    cylinder(r1=5.2/2/.866+.1,r2=3.2/.866,h=5,$fn=6);
+    translate([0,0,-30]) cylinder(r=m3rad+.1,h=31,$fn=13);
+  }
+}
+
+module pulleyProxy() {
+  rotate([90,0,0]) difference() {
+    cylinder(r=11.5/2,h=8,center=true,$fn=48);
+    cylinder(r=1.5,h=9,center=true,$fn=16);
+  } 
+}
+
+module pulleyArea() {
+w2=5.2;
+h2=2.5+.2;
+cr=2.5;
+bh=baseHeight+5;
+ef=24;
+  difference() {
+    hull() {
+      translate([-w2, h2,-1]) cylinder(r=cr,h=bh,$fn=ef);
+      translate([-w2,-h2,-1]) cylinder(r=cr,h=bh,$fn=ef);
+      translate([ w2, h2,-1]) cylinder(r=cr,h=bh,$fn=ef);
+      translate([ w2,-h2,-1]) cylinder(r=cr,h=bh,$fn=ef);
+    }
+
+    translate([0,-4,baseHeight/2]) rotate([ 90,0,0]) cylinder(r1=2.5,r2=6,h=3,$fn=22);
+    translate([0, 4,baseHeight/2]) rotate([-90,0,0]) cylinder(r1=2.5,r2=6,h=3,$fn=22);
+  }
+}
+
+module pulleyHolder() {
+  difference() {
+    union() {
+      translate([-boltSep,0,0]) boltHolder();
+      translate([ boltSep,0,0]) boltHolder();
+      hull() {
+        translate([-boltSep,0,0]) scale([.9,1.1,1]) cylinder(r=baseRad,h=baseHeight,$fn=48);
+        translate([ boltSep,0,0]) scale([.9,1.1,1]) cylinder(r=baseRad,h=baseHeight,$fn=48);
+        // 16 wide is about perfect for M3-14 bolt.
+        // may want to switch to an M3-16 in the future, so this would have to be wider
+        translate([0,0,baseHeight/2]) 
+          rotate([90,0,0]) cylinder(r=4,h=16,center=true,$fn=24);
+      }
+    }
+
+    translate([-boltSep,0,baseHeight]) nutHole();
+    translate([ boltSep,0,baseHeight]) nutHole();
+    translate([0,-baseRad-1,baseHeight/2]) rotate([ 90,0,0]) nutHole();
+    translate([0, baseRad+1,baseHeight/2]) rotate([-90,0,0])
+      cylinder(r1=5.5/2-.1,r2=5.5/2+.3,h=5,$fn=23);
+    pulleyArea();
+  }
+}
+
+
+pulleyHolder();
+
+%translate([0,0,baseHeight/2]) pulleyProxy();
diff --git a/retractable.scad b/retractable.scad
index a83f37c..cf770b0 100644
--- a/retractable.scad
+++ b/retractable.scad
@@ -9,47 +9,44 @@ face_offset = 4;
 
 module foot() {
   difference() {
-    translate([12.5, 0, 0]) rotate([0, 0, -60])
-      translate([-12.5, 0, 1]) rotate([0, 0, -60]) union() {
-        cylinder(r=5, h=2, center=true, $fn=24);
-        translate([10, 0, 0])
-          cube([20, 10, 2], center=true);
+    rotate([0,0,-60]) hull() {
+      translate([12.5,0,0]) cylinder(r=5, h=4, $fn=24);
+      translate([1,-3,0]) scale([1,2,1]) cylinder(r=1,h=12,$fn=9);
     }
-    translate([0, -10, 0])
-      cube([40, 20, 20], center=true);
     translate([12.5, 0, 0]) {
-      // Space for bowden push fit connector.
-      cylinder(r=6.49, h=3*height, center=true, $fn=32);
       for (a = [60:120:359]) {
-	    rotate([0, 0, a]) translate([-12.5, 0, 0])
+	    rotate([0, 0, a]) translate([-12.5, 0, 0]) {
           cylinder(r=m3_wide_radius, h=20, center=true, $fn=12);
-      }
+          translate([0,0,2.5]) cylinder(r1=3.05, r2=3.5, h=10, $fn=6);
+      }}
     }
   }
 }
 
+module hotEndHullProxy() {
+  hull() {
+    translate([0,0,1]) cylinder(r=3,h=17,$fn=24);
+    cylinder(r=9,h=13,$fn=6);
+  }
+}
+
 module retractable() {
   difference() {
     union() {
       translate([0, 0, height/2])
         cylinder(r=6, h=height, center=true, $fn=32);
-      translate([0, -3, height/2])
-        cube([12, 6, height], center=true);
-      // Lower part on the left.
-      translate([-6, 0, height2/2])
-        cylinder(r=6, h=height2, center=true, $fn=32);
-      translate([-3, 0, height2/2])
-        cube([6, 12, height2], center=true);
-      translate([-3, -3, height2/2])
-        cube([18, 6, height2], center=true);
+      translate([0, -3, height/2]) cube([12, 6, height], center=true);
+      hull() {
+        translate([-6,-4,0]) cube([2,4,26]);
+        translate([-2,2,15]) cylinder(r=3,h=4,$fn=16);
+        translate([-8,-2,0]) rotate([0,0,-50]) scale([1.5,2,1]) cylinder(r=2,h=8,$fn=24);
+      }
       // Feet for vertical M3 screw attachment.
       rotate([0, 0, 90]) {
         foot();
         scale([1, -1, 1]) foot();
       }
     }
-    translate([-19, 0, height/2+6]) rotate([0, 15, 0])
-      cube([20, 20, height], center=true);
     cylinder(r=tunnel/2+extra_radius, h=3*height, center=true, $fn=12);
     translate([0, -6, height/2+12])
       cube([tunnel-0.5, 12, height], center=true);
@@ -57,25 +54,47 @@ module retractable() {
       cube([tunnel, 12, height], center=true);
     // Safety needle spring.
     translate([-4.5, 0, height-11]) rotate([90, 0, 0])
-      cylinder(r=2.5/2, h=40, center=true, $fn=12);
+      translate([0,0,-8]) cylinder(r=2.5/2, h=20, $fn=12);
     translate([-4, 0, height-2]) rotate([90, 0, 0])
-      cylinder(r=1/2, h=40, center=true, $fn=12);
-    // Effector screw heads.
-    rotate([0, 0, 330]) translate([-12.5, 0, 2])
-      cylinder(r=4, h=30, $fn=24);
+      translate([0,0,-2]) cylinder(r=1/2, h=20, $fn=12);
     // Flat front face.
     translate([0, -face_offset-10, height/2]) difference() {
       cube([30, 20, 2*height], center=true);
     }
+    // make sure we clear the hot-end hull on top
+    translate([0,12.5,-1]) hotEndHullProxy();
     // Sub-miniature micro switch.
-    translate([-2.5, -face_offset-3, 5]) {
+    translate([-2.5+0.7, -face_offset-3, 5]) {
       % microswitch();
       for (x = [-9.5/2, 9.5/2]) {
         translate([x, 0, 0]) rotate([90, 0, 0])
-          cylinder(r=2.5/2, h=40, center=true, $fn=12);
+          translate([0,0,-9]) cylinder(r=2.5/2, h=20, $fn=12);
       }
     }
   }
 }
 
-retractable();
+// put solid layer below holes for quelab printer
+//union(){
+//  translate([0,0,0.15])
+difference() {
+    retractable();
+    translate([0,0,-.1]) #cylinder(r=3.95/2,h=10.5,$fn=24);
+}
+//  color("Cyan") {
+//    hull() {
+//      translate([-11,-4.5,0]) cube([7,10,.3]);
+//      translate([-11,6.5,0]) cylinder(h=.3,r=5.5,$fn=16);
+//    }
+//    hull() {
+//      translate([4,-4.5,0]) cube([2,10,.3]);
+//      translate([ 11,6.5,0]) cylinder(h=.3,r=5.5,$fn=16);
+//    }
+//    translate([-4.5,-4.5,0]) cube([9,10,.3]);
+//  }
+//}
+
+// show in relation to effector head :
+//use <effectorC.scad>;
+//%translate([0,12.5,-4]) scale([1.02,1.02,1]) effector();
+
diff --git a/retractable.stl b/retractable.stl
deleted file mode 100644
index e7b530d..0000000
Binary files a/retractable.stl and /dev/null differ
diff --git a/rodMountHorn.scad b/rodMountHorn.scad
new file mode 100644
index 0000000..98c4754
--- /dev/null
+++ b/rodMountHorn.scad
@@ -0,0 +1,30 @@
+//include <configuration.scad>;
+
+// parameters for rod mount horns.
+// these parameters should be the same for the carriage horns.
+separation = 40+10;  // Distance between ball joint mounting faces.
+cone_r1 = 2.5;
+cone_r2 = 20;
+cone_height=18;
+
+module rodMountHorn() {
+  for (s = [-1, 1]) scale([s, 1, 1])
+    translate([separation/2-9, 0, 0]) rotate([0, 90, 0])
+      cylinder(r1=cone_r2, r2=cone_r1, h=cone_height, center=true, $fn=24);
+}
+
+m3rad = 2.94/2;
+m3nutRad = 5.5/cos(30)/2;
+
+// boreLen is length of M3 bore before nut holder
+module rodMountHornBore(fuzz=0.1,boreLen=15) {
+  rotate([0,90,0]) {
+    cylinder(r=m3rad+fuzz,h=separation+1,$fn=12,center=true);
+    cylinder(r=m3nutRad+fuzz*2,h=separation-2*boreLen,$fn=6,center=true);
+  }
+}
+
+difference() {
+  rodMountHorn();
+  #rodMountHornBore();
+}
diff --git a/smoothie.scad b/smoothie.scad
new file mode 100644
index 0000000..e1e81c3
--- /dev/null
+++ b/smoothie.scad
@@ -0,0 +1,144 @@
+
+//projection(cut=true)
+//%translate([0,0,-121]) import("smoothie.stl"); // older 4-driver smoothie board
+%translate([-3,14,3+6]) rotate([90,0,90]) import("smoothieX5.stl");
+
+module smoothie4Holes() {
+hr = 1.8; // hole radius
+hh = 9;  // hole height
+$fn=12;
+  translate([-31,-27.45 ,-1]) cylinder(h=hh,r=hr);
+  translate([-37.45,65.4,-1]) cylinder(h=hh,r=hr);
+  translate([61.5,-32.5 ,-1]) cylinder(h=hh,r=hr);
+  translate([61.6,65.4  ,-1]) cylinder(h=hh,r=hr);
+
+  translate([62.3,13.1  ,-1]) cylinder(h=hh,r=hr+.2);
+  translate([62.3,23.2  ,-1]) cylinder(h=hh,r=hr+.2);
+}
+
+module smoothieX5holes(hr=1.8,hrp=2) {  // hole sizes on board
+$fn=12;
+hh=9;
+  translate([  3.6, 27.9,-1]) cylinder(h=hh,r=hr);
+  translate([  8.5,120.9,-1]) cylinder(h=hh,r=hr);
+  translate([101.6, 28.4,-1]) cylinder(h=hh,r=hr);
+  translate([101  ,127.4,-1]) cylinder(h=hh,r=hr);
+
+  translate([49.5,4,-1]) cylinder(h=hh,r=hrp);
+  translate([59.5,4,-1]) cylinder(h=hh,r=hrp);
+}
+
+twx = 130;  // x tab width
+twy = 150;  // y tab width
+twz = 70;
+tw = 2.8;  // cutout tab width
+tw1 = 3;  // slightly longer tab width for finger joints
+fuzz = .1;
+module smoothieX5botPlate() {
+cr = 3;  // plate rounded corner radius
+bw = 6;  // border width, outside tabs
+  difference() {
+    hull() {
+      translate([ -tw/2-bw,   -tw-bw,0]) cylinder(h=3,r=cr,$fn=24);
+      translate([ -tw/2-bw,twy+tw+bw,0]) cylinder(h=3,r=cr,$fn=24);
+      translate([twx+tw+bw,twy+tw+bw,0]) cylinder(h=3,r=cr,$fn=24);
+      translate([twx+tw+bw,   -tw-bw,0]) cylinder(h=3,r=cr,$fn=24);
+    }
+
+    translate([3,19,0]) smoothieX5holes(hr=2.9/2,hrp=2.9/2);
+
+    for (x=[-1.4-fuzz,twx+tw/2+fuzz])
+      for (y=[5:20:twy]) translate([x,y,0])
+        cube([tw,10,22],center=true);
+
+    for (y=[-1.4-fuzz,twy+tw/2+fuzz])
+      for (x=[15:20:twx]) translate([x,y,0])
+        cube([10,tw,22],center=true);
+  }
+}
+
+module smoothieSidePlate(PWMcutOut=1, stepperCutOut=1) {
+  difference() {
+    cube([twy+2*tw1,twz+2*tw1,tw]);
+
+    if (PWMcutOut) {
+      translate([ 49,9,-1]) cube([39,12,5]);
+      translate([ 84.5,9,-1]) cube([20,10,5]);
+      translate([109.5,9,-1]) cube([10,10,5]);
+    }
+
+    if (stepperCutOut) { // stepper sire cut-outs
+      for (i=[73,123])
+      translate([i,27,-1]) scale([2,1,1]) cylinder(r=5.5,h=5,$fn=24);
+      //%translate([75,30,0]) cube([12,6,15],center=true);
+
+      translate([145,35,-1]) mirror([1,0,0]) sunon1208fanHole();
+    }
+
+    for(j=[-1,twz+tw1]) for (i=[10+tw1:20:twy-1])
+        translate([i,j,-1]) cube([10,tw1+1,5]);
+
+    for (j=[-1,153]) {
+      translate([j,    -1,-1]) cube([tw1+1,10+1+tw1,5]);
+      translate([j,20+tw1,-1]) cube([tw1+1,10      ,5]);
+      translate([j,40+tw1,-1]) cube([tw1+1,10      ,5]);
+      translate([j,60+tw1,-1]) cube([tw1+1,10+1+tw1,5]);
+    }
+
+  }
+}
+
+module sunon1208fanHole() {
+   cube([106+1,20.6+1,6]);
+   translate([21,10,0]) cube([50,25.5+1-10,6]);
+   translate([21+28,13,0]) cube([50,25.5+1-10,6]);
+   translate([21+27+27,16,0]) cube([29+1+2,25.5+1-10,6]);
+}
+
+module smoothieEndPlate(dataCutOut=1) {
+  difference() {
+    cube([twx+2*tw1,twz+2*tw1,2.8]);
+
+    for (y=[-1,twz+tw1]) {
+      for(i=[tw1:20:twx])
+        translate([i,y,-1]) cube([10,tw1+1,5]);
+      translate([-1,y,-1]) cube([10,tw1+1,5]);
+      translate([twx-5,y,-1]) cube([15,4,5]);
+    }
+
+    for(x=[-1,twx+tw1]) for(y=[13:20:55])
+      translate([x,y,-1]) cube([4,10,5]);
+
+    if(dataCutOut) {
+      translate([19,8,-1]) cube([51,6,5]);
+      translate([19,10,-1]) cube([20,13,5]);
+      translate([34,10,-1]) cube([18,16,5]);
+    }
+
+  }
+}
+
+//projection(cut=true) translate([0,0,-1])
+smoothieX5botPlate();
+//translate([0,0,74]) smoothieX5botPlate();
+//#smoothieX5holes();
+
+if(1) {
+color([.8,.4,.4])
+translate([0,153.6,0]) rotate([90,0,-90])
+  smoothieSidePlate();
+color([.4,.8,.4])
+translate([130,-tw1-fuzz,0]) rotate([90,0,90])
+   smoothieSidePlate();
+}
+//projection(cut=true) translate([0,0,-1]) smoothieSidePlate();
+
+if(1) {
+color([.3,.8,1])
+translate([-tw1,0,0]) rotate([90,0,0]) smoothieEndPlate();
+color([.3,.8,.6])
+translate([-tw1,twy+tw+fuzz,0]) rotate([90,0,0]) smoothieEndPlate();
+}
+//projection(cut=true) translate([0,0,-1]) smoothieEndPlate();
+
+////translate([0,0,100]) sunon1208fanHole();
diff --git a/support.scad b/support.scad
new file mode 100644
index 0000000..dfadeb0
--- /dev/null
+++ b/support.scad
@@ -0,0 +1,44 @@
+module earBrace() {
+  intersection () {
+    hull() {
+      rotate([0,55,0]) scale([2,1,1]) cylinder(r=.4,h=7,$fn=12);
+      linear_extrude(height=0.1)
+        polygon(points=[[0,0],[7,1.5],[7,-1.5]], paths=[[0,1,2,0]]);
+    }
+    translate([-2,-5,0]) cube([10,10,10]);
+  }
+}
+
+module supportPillar(x,y,len,rot=0,r=2,xscale=1,yscale=1) {
+  translate([x,y,0]) difference() {
+                          rotate([0,0,rot]) scale([xscale,yscale,1]) cylinder(r=r    ,h=len  ,$fn=6);
+    translate([0,0,-0.5]) rotate([0,0,rot]) scale([xscale,yscale,1]) cylinder(r=r-.25,h=len+1,$fn=6);
+  }
+}
+module supportPillar4(x,y,dx,dy,dz,rot=0) {
+t=0.2;
+  translate([x,y,dz/2]) rotate([0,0,rot]) difference() {
+    cube([dx  ,dy  ,dz  ],center=true);
+    cube([dx-t,dy-t,dz+1],center=true);
+  }
+}
+
+module zigZag(ylen,width,height,step,thick=0.4) {
+  union() {
+    for(y=[0:step:ylen]) {
+      hull() {
+        translate([-width/2,y       ,0]) cylinder(h=height,r=thick/2,$fn=3);
+        translate([ width/2,y+step/2,0]) cylinder(h=height,r=thick/2,$fn=3);
+      }
+      hull() {
+        translate([ width/2,y+step/2,0]) cylinder(h=height,r=thick/2,$fn=3);
+        translate([-width/2,y+step  ,0]) cylinder(h=height,r=thick/2,$fn=3);
+      }
+    }
+  }
+}
+
+translate([0,10,0]) earBrace();
+supportPillar4(10,0,4,6,2,45);
+supportPillar(-10,0,4);
+translate([0,-22,0]) zigZag(20,4,4,2);
diff --git a/switch_holder.stl b/switch_holder.stl
deleted file mode 100644
index 499846a..0000000
Binary files a/switch_holder.stl and /dev/null differ
diff --git a/tiltedDelta.scad b/tiltedDelta.scad
new file mode 100644
index 0000000..648a457
--- /dev/null
+++ b/tiltedDelta.scad
@@ -0,0 +1,232 @@
+use <ext20v.scad>;
+//cube([10,10,10]);
+
+// openbeam sells 1515 extrusions in 270length (and others).
+// I think I got misumi at 300, but they are selectable.
+
+// the simple drawing, ext15.scad has no fuzz, so I'll
+// use the OpenBeam model, ext15ob.scad until I add that.
+use <ext15ob.scad>;
+
+baseExtLen = 300;
+railTilt = 10.8;  // degrees
+
+use <nema17.scad>;
+
+difference() {
+  //union() {
+    translate([0,140,100]) baseVertex();
+  //  translate([0,0,960]) apex();
+  //  translate([0,213,-4]) foot();
+  //}
+
+  dilatedExtrusions();  // for cut-outs for extrusions
+}
+
+module foot() {
+  //%rotate([0,0,45]) cylinder(r1=20,r2=5,h=20,$fn=4);
+  hull() {
+    for(x=[-1,1]) for(y=[-1,1])
+      translate([12*x,12*y,2]) sphere(2,$fn=24);
+    translate([0,0,12]) sphere(12,$fn=36);
+  }
+}
+
+module apex() {
+  difference() {
+    hull() for (a=[-120,0,120]) rotate([0,0,a]) for(x=[-1,1]) {
+      translate([10*x,36, 0]) sphere(2,$fn=36);
+      translate([10*x,33,16]) sphere(2,$fn=36);
+    }
+
+    translate([0,0,-4]) cylinder(r1=15,r2=10,h=24,$fn=6);
+
+    // remove outside slot residual, and (most of) side rails
+    for (a=[-120,0,120]) rotate([0,0,a]) 
+      translate([0,30, 0]) 
+        rotate([railTilt,0,0]) cube([19.6,16,50],center=true);
+
+    // side bolt holes
+    for (a=[-120,0,120]) rotate([0,0,a]) for(x=[-1,1])
+      translate([15*x,27.1,8.6]) 
+        rotate([0,-90*x,0]) rotate([0,0,90]) M5boltHole(.15);
+
+    // inside bolt holes
+    for (a=[-120,0,120]) rotate([0,0,a])
+      translate([0,11,6]) 
+        rotate([railTilt-90,0,0]) M5boltHole(.15);
+
+
+    // flat edge cut-outs   
+    //for (a=[-60:120:355]) rotate([0,0,a]) 
+    //  #translate([0,28,-4]) scale([3.5,1,1]) cylinder(r1=7,r2=7,h=24,$fn=6);
+  }
+}
+
+//%scale(1.02) nema17();
+//nema17MountHoles();
+
+// shave off some odities from main vertex and drill holes
+module baseVertex() difference() {
+  baseVertexShell();
+
+  translate([0,11,-16]) rotate([railTilt-90,0,0]) {
+    //%scale(1.02) nema17();
+    nema17MountHoles();
+  }
+
+  // remove outside of vertical rail strip
+  translate([0,60,0]) rotate([railTilt,0,0]) 
+       cube([10,5,20],center=true);
+
+  railZone();
+  mirror([1,0,0]) railZone();
+
+  for (a=[-1,1]) translate([31.6*a,2,0]) rotate([0,0,-90-a*60])
+    rotate([0,90,0]) M3railHole(8);
+  for (a=[-1,1]) translate([17*a,28,0]) rotate([0,0,-90-a*60])
+    rotate([0,90,0]) M3railHole(8);
+
+  // inside 20v mount screw
+  translate([0,37.5,-4])
+    rotate([railTilt-90,0,0]) M5boltHole();
+
+  for (a=[-1,1])  translate([16.5*a,53,0])
+     rotate([0,-90*a,0]) rotate([0,0,a*(90-railTilt)]) M5boltHole();
+
+}
+
+// hole for setting up an 8mm M3 screw to attach to a 1515 extrusion
+module M3railHole() {
+nutRad = 5.46/2/cos(30);
+  M3screwHole(8);
+  translate([0,0,-8.8]) rotate([0,0,30])
+    cylinder(r1=nutRad+.2,r2=nutRad,h=4,$fn=6);
+}
+
+// get rid of extranious junk around rails on vertex
+module railZone() {
+  translate([-47,1.5,0]) rotate([0,0,-30]) {
+    //hull() {
+      cube([12,100,16],center=true);
+      //translate([-10,30,-40]) cube(1);
+    //}
+    hull() {
+      translate([-10,20,-40]) cube(1);
+      translate([4,0,-5]) cube([9,100,5],center=true);
+    }
+  }
+}
+
+module baseVertexShell() {
+cr=2;  // corner radius
+zHi=7.5-cr;
+zLo=-7.5+cr;//-4;
+  union() {
+
+    hull() {
+      for(x=[-1,1]) {
+        translate([11*x,59,zHi]) sphere(r=cr,$fn=24);
+        translate([11*x,61,zLo]) sphere(r=cr,$fn=24);
+
+        for(z=[zLo,zHi]) translate([27*x,44,z]) sphere(r=cr,$fn=24);
+        for(z=[zLo,zHi]) translate([44*x,-2,z]) sphere(r=cr,$fn=24);
+      }
+
+//        for(z=[zLo,zHi]) {
+//          translate([x*40,0,z]) sphere(r=cr,$fn=24);
+//        }
+//      }
+    }
+
+    hull() for(x=[-1,1]) {
+      // repeat lower nodes on outside of vertex tip
+      translate([11*x,61,zLo]) sphere(r=cr,$fn=24);
+      translate([30*x,15,-36]) sphere(r=cr,$fn=24);
+      translate([30*x, 4,-4 ]) sphere(r=cr,$fn=24);
+    }
+
+    //%hull() {
+    //  translate([0,40,0]) cube([30,1,1],center=true);
+    //  cube([70,2*cr,10],center=true);
+    //  for (x=[-1,1]) translate([x*25,8,-40]) sphere(r=cr,$fn=24);
+    //}
+
+  }
+}
+
+module M3screwHole(holeDepth=10,sinkHeight=4,fuzz=0.05) {
+  translate([0,0,-holeDepth]) cylinder(r=2.96/2+fuzz,h=holeDepth+1,$fn=16);
+  cylinder(r1=5.38/2+fuzz,r2=5.38/2+sinkHeight*fuzz/2,h=sinkHeight,$fn=20);
+}
+
+module nema17MountHoles() {
+  // make central more superset of shaft
+  cylinder(r=11+1, h=2*9+35, $fn=48,center=true);
+  //#cylinder(r=2.5+.2, h=25, $fn=36);  // shaft
+
+  for (a = [0:90:359]) {
+    rotate([0, 0, a]) translate([15.5, 15.5, 0])
+      cylinder(r=2.94/2+.1, h=20, $fn=11,center=true);
+  }
+}
+
+
+module dilatedExtrusions() {
+  for (a=[-120,0,120]) rotate([0,0,a]) 
+    translate([0,212,0])
+      rotate([railTilt,0,0]) {
+
+        // make a little indent at foot of model to make feet fit better
+        difference() {
+          ext20(1000,.1,0);
+          cube([14,14,1],center=true);
+        }
+
+        // want NEMA face plate 36ish mm from extrusion.
+        // make sure this is carved out
+        hull() {
+          for(x=[-1,1]) translate([25*x,-7.5-36-4,100])
+             cylinder(r=4,h=80,$fn=24,center=true);
+          translate([0,-7.5-36-30,100]) cube([90,1,80],center=true);
+        }
+        //%hull() {
+        //  translate([0,-7.5-36-20,100]) cube([50,40,80],center=true);
+        //  translate([0,-7.5-36-30,100]) cube([90,1,80],center=true);
+        //}
+
+        // clear zone for linear motion parts around shaft
+        hull() for(x=[-1,1]) {
+          translate([10*x,-19,50]) cylinder(r=3,h=100,$fn=24);
+          translate([20*x,-36,50]) cylinder(r=3,h=100,$fn=24);
+        }
+      }
+
+  for (a=[-90,30,150]) rotate([0,0,a])
+    translate([110,(baseExtLen+1)/2,100])
+      rotate([90,0,0]) difference() {
+        ext15(baseExtLen+1,.1);
+
+        // cut out ext hallow .5mm too long, but put a little
+        // spacer at the desired position
+        cube([12,12,1],center=true);
+        cylinder(r1=2,r2=1,h=2,$fn=16);
+        translate([0,0,baseExtLen+1]) cube([12,12,1],center=true);
+        translate([0,0,baseExtLen-1]) cylinder(r1=1,r2=2,h=2,$fn=16);
+      }
+}
+
+
+m5rad = 4.92/2;//4.88/2;
+m5_head_radius = 8.62/2;//8.5/2;  // 5mm head height, uses 4mm hex drive
+
+module M5boltHole(fuzz=0.05) {
+    cylinder(r=m5rad+fuzz,h=11,$fn=15);
+    translate([0,0,-14])
+       cylinder(r2=m5_head_radius,r1=m5_head_radius+1,h=15,$fn=24);
+
+    // extra clearance for extrusion nut
+    translate([0,0,8.8]) cube([10,16,4],center=true);
+    translate([0,0,6  ]) cylinder(r=3.5+.2,h=4,$fn=17);
+
+}
diff --git a/topAssem.scad b/topAssem.scad
new file mode 100644
index 0000000..12e6bbf
--- /dev/null
+++ b/topAssem.scad
@@ -0,0 +1,75 @@
+// complete top (bottom) assembly, fused with vertexB drawing.
+// take a slice of this to generate DXF drawing for laser cut
+
+use <vertexB.scad>;
+
+m3rad = 2.94/2-.1;
+
+//projection(cut=true)
+translate([0,0,-0.2]) {
+  difference() {
+    union() {
+      for (a=[0,120,240]) {
+        rotate([0,0,a]) translate([0,-141,0]) vertexB(16,-0.15);
+      }
+
+      difference() {
+        intersection() {
+          rotate([0,0,30]) cylinder(r=221,h=15,$fn=3);
+          translate([0,0,-1]) rotate([0,0,-30]) cylinder(r=333,h=17,$fn=3);
+        }
+
+        // open holes so that holes from vertex can show through
+        for (a=[0,120,240]) { rotate([0,0,a])
+          for (b=[-1,1]) {
+            translate([58*b,-108,-1]) cylinder(r=4,h=23,$fn=6);
+            translate([40*b,-138,-1]) cylinder(r=4,h=23,$fn=6);
+          }
+        }
+      }
+    }
+
+    // drill more holes in top plate
+    translate([0,0,-1]) {
+
+      // drill edge holes
+      for (b=[0,120,240]) {
+        rotate([0,0,b]) {
+          for (c=[-1,0,1]) {
+            translate([c*35,104,0]) cylinder(r=m3rad,h=27,$fn=11);
+          }
+        }
+      }
+
+      // holes for belt tensioner idler
+      //    should be about 20mm in from front of extrusion
+      %translate([0,-158,18]) cube([2*12,20,5],center=true);  // diagnostic for spacing from extrusion
+      for (a=[30,150,270]) {
+        rotate([0,0,a]) {
+          for(b=[-1,1]) {
+            translate([148,12*b,0]) cylinder(r=m3rad,h=27,$fn=11);
+          }
+        }
+      }
+
+      if (1) {
+         // decorative holes
+         cylinder(r=30,h=17,$fn=120);
+         for(d=[0,60,120,180,240,300]) {
+           rotate([0,0,d]) translate([75,0,0]) cylinder(r=25,h=17,$fn=96);
+         }
+         for(d=[30,150,270]) {
+           rotate([0,0,d]) translate([112,0,0]) cylinder(r=15,h=17,$fn=96);
+         }
+      } else {
+         // a big ring might be better for under print bed
+         cylinder(r=90,h=18,$fn=120);
+      }
+
+    }
+  }
+}
+
+%translate([-350/2,130,0]) cube([350,20,20]);
+%translate([0,0,20]) cylinder(r=9*25.4/2,h=4,$fn=180);
+%translate([0,0,30]) cylinder(r=250/2,h=3.3,$fn=180);
\ No newline at end of file
diff --git a/topPlate340x300.pl b/topPlate340x300.pl
new file mode 100755
index 0000000..5399a11
--- /dev/null
+++ b/topPlate340x300.pl
@@ -0,0 +1,150 @@
+#!/usr/bin/perl -w
+# $URL$
+# $Id$
+#
+# top brace plate for mini-kossel
+#
+# Extrusion is (ideally) 240mm.  Inside triangle formed by
+# extrusion is (ideally) 269.445mm
+
+require 'laserPartsUtil.pl';
+
+# get this from file name to make SURE it matches
+($wmm,$hmm) = &parseSizeFromFileName($0);
+
+&printLaserCutHeader($wmm,$hmm);
+
+$pi = 3.14159265359;
+$deg2rad = $pi / 180;
+$s60 = sin(60*$deg2rad);
+
+$iLen = 240 + 2 * 30*$s60;  # inside length of triangle (sin(60)==cos(30))
+$rCurve = 4;  # radius of curves
+$truncOffset = 69;  # how far back from vertex do we want curve
+$extWidth = 15; # extrusion width
+$borderWidth = $extWidth; # width of border past inside iLen triangle
+$boltOffset = 61;  # dist from corner of extrusion centerline triangle to put first bolt
+$pulleyInsetFromInsideVertex = 45;  # approx.  needs calibration
+$pulleyBoltSep = 12;  # from pulleyHolder.scad
+$pulleyBraceLen = 40;
+$pulleyBraceRad = 8;
+
+$oLen = $iLen + 2*2*$borderWidth*$s60;  # outside triangle length
+$sLen = $iLen +   2*   $extWidth*$s60;  # extrusion slot centerline triangle len
+local $yLo = (sin(30*$deg2rad)/cos(30*$deg2rad)) * ($oLen/2);
+local $h = sqrt(3) * $oLen / 2;
+print STDERR "yLo $yLo\n";
+
+printf("<g transform='translate(%.3f,%.3f)'>\n",$wmm/2,$hmm*0.65);
+
+local $iyLo = $yLo-$borderWidth;
+local $yHi = $yLo-$h;
+local $iyHi = $yHi + 2 * $borderWidth;
+
+# Slot center line
+local $syLo = (sin(30*$deg2rad)/cos(30*$deg2rad)) * ($sLen/2);
+local $sh = sqrt(3) * $sLen / 2;
+local $syHi = $syLo-$sh;
+
+&printEquilateralTriangle($oLen, $yLo,$ yHi);  # outside border of plate
+&printEquilateralTriangle($iLen,$iyLo,$iyHi);  # inside border of extrusion
+&printEquilateralTriangle($sLen,$syLo,$syHi);  # centerline of extrusion slot
+
+&printTruncTriangle(0,0,0,$oLen,$truncOffset,$rCurve);
+
+$r3 = 2.94/2 - 0.1; # radius for hole for M3 screw
+local $br = (($iLen/2) / $s60) - $pulleyInsetFromInsideVertex;
+#print STDERR "iLen = $iLen\npulley bolt radius = $br\n";
+&plotPulleyBoltHoles($br,   0,$pulleyBoltSep);
+&plotPulleyBoltHoles($br, 120,$pulleyBoltSep);
+&plotPulleyBoltHoles($br,-120,$pulleyBoltSep);
+
+### braces for pulley bolts
+local $pbr = $pulleyBraceRad;
+local $pbd = 2*$pulleyBoltSep;
+local $pbl = $pulleyBraceLen;
+local $x0 = -60.4;
+local $y0 = -110;
+local $pd = $pulleyBraceLen + 2*$pulleyBraceRad + 0.2;
+&plotBrace($x0,$y0,120,$r3,$pbr,$pbd,$pbl); $x0 -= 0.5*$pd;  $y0 += $s60*$pd;
+&plotBrace($x0,$y0,120,$r3,$pbr,$pbd,$pbl); $x0 -= 0.5*$pd;  $y0 += $s60*$pd;
+&plotBrace($x0,$y0,120,$r3,$pbr,$pbd,$pbl);
+#&plotBrace(0,-$br,180,$r3,$pbr,$pbd,$pbl); # diag: show overlay
+
+### edge bolt holes
+
+local $x1 = -$sLen/2+$boltOffset;
+local $nf = 24;  # number of facets for bolt holes
+&plotCircle(-$x1,$syLo,$r3,$nf);
+&plotCircle( $x1,$syLo,$r3,$nf);
+&plotCircle(  0 ,$syLo,$r3,$nf);
+local $dx = -2 * $x1;
+$x1 = $boltOffset/2;
+local $y1 = $syHi + $s60 * $boltOffset;
+print STDERR "syLo=$syLo  syHi=$syHi  sh=$sh  y1=$y1\n";
+&plotCircle( $x1,$y1,$r3,$nf);
+&plotCircle(-$x1,$y1,$r3,$nf);   $x1 += $dx/4;   $y1 += $s60 * $dx/2;
+&plotCircle( $x1,$y1,$r3,$nf);
+&plotCircle(-$x1,$y1,$r3,$nf);   $x1 += $dx/4;   $y1 += $s60 * $dx/2;
+&plotCircle( $x1,$y1,$r3,$nf);
+&plotCircle(-$x1,$y1,$r3,$nf);
+
+# decorative holes
+$dx=60;
+$br=30;
+$nf=90;
+&plotCircle(    0    ,-$dx  ,$br,$nf);
+&plotCircle( $dx*$s60, $dx/2,$br,$nf);
+&plotCircle(-$dx*$s60, $dx/2,$br,$nf);
+
+print "</g></g></svg>";
+
+
+sub printTruncTriangle() {
+    local ($x0,$y0,$rot,$len,$offst,$rc) = @_;
+
+    local $h = sqrt(3) * $len / 2;
+    local $yLo = (sin(30*$deg2rad)/cos(30*$deg2rad)) * ($len/2);
+    local $yHi = $yLo - $h;
+    local $v1x = $len/2; local $v1y = $yLo;
+    local $v2x = 0;      local $v2y = $yHi;
+    local $v3x = -$v1x;  local $v3y = $v1y;
+
+    print "<path transform='translate($x0,$y0) rotate($rot)' d='";
+    &drawArc('M',$v1x-$offst           ,$v1y-$rc              , $rc,  90,  30,-3);
+    &drawArc('L',$v1x-$offst/2-$s60*$rc,$v1y-$s60*$offst+$rc/2, $rc,  30, -30,-3);
+    &drawArc('L',$v2x+$offst/2-$s60*$rc,$v2y+$s60*$offst+$rc/2, $rc, -30, -90,-3);
+    &drawArc('L',$v2x-$offst/2+$s60*$rc,$v2y+$s60*$offst+$rc/2, $rc, -90,-150,-3);
+    &drawArc('L',$v3x+$offst/2+$s60*$rc,$v3y-$s60*$offst+$rc/2, $rc,-150,-210,-3);
+    &drawArc('L',$v3x+$offst           ,$v3y-$rc              , $rc,-210,-270,-3);
+    print " Z'/>\n";
+}
+
+sub plotPulleyBoltHoles() {
+    local ($pulleyRad, $ang, $boltSep) = @_;
+
+    print "<desc>Pulley Carriage Bolt Holes</desc><g transform='rotate($ang)'>\n";
+    &plotCircle(-$boltSep,-$pulleyRad,$r3,18);
+    &plotCircle( $boltSep,-$pulleyRad,$r3,18);
+    print "</g>\n";
+}
+
+sub plotBrace() {
+    local ($x0,$y0,$rot,$ri,$ro,$len,$bLen) = @_;
+
+    print "<desc>Connector Link (pulley bolt brace)</desc>
+<g transform='translate($x0,$y0) rotate($rot)'>\n";
+    &plotCircle(-$len/2,0,$ri,24);
+    &plotCircle( $len/2,0,$ri,24);
+    print "<path d='";
+    &drawArc('M', $bLen/2,0,$ro,-90, 90,6);
+    &drawArc('L',-$bLen/2,0,$ro, 90,270,6);
+    print "'/></g>\n";
+}
+
+sub printEquilateralTriangle() {
+    local ($len,$lo,$hi) = @_;
+
+    print "<path style='stroke:#FFAA00' d='";
+    printf("M%.3f,%.3f L0,%.3f L%.3f,%.3f Z'/>\n",$len/2, $lo, $hi,-$len/2, $lo);
+}
diff --git a/vertex.scad b/vertex.scad
index 44382aa..a9acde1 100644
--- a/vertex.scad
+++ b/vertex.scad
@@ -3,9 +3,13 @@ include <configuration.scad>;
 $fn = 24;
 roundness = 6;
 
+m3rad = 2.93/2;
+m3headRad = 5.36/2;
+m3nutRad = 5.5/2/cos(30);
+
 module extrusion_cutout(h, extra) {
   difference() {
-    cube([extrusion+extra, extrusion+extra, h], center=true);
+    cube([extrusion+extra+.3, extrusion+extra+.3, h], center=true);
     for (a = [0:90:359]) rotate([0, 0, a]) {
       translate([extrusion/2, 0, 0])
         cube([6, 2.5, h+1], center=true);
@@ -14,87 +18,136 @@ module extrusion_cutout(h, extra) {
 }
 
 module screw_socket() {
-  cylinder(r=m3_wide_radius, h=20, center=true);
-  translate([0, 0, 3.8]) cylinder(r=3.5, h=5);
+extraCounterSink = 0.4;  // add a little extra countersink for Quelab printer
+  cylinder(r=m3rad+0.1, h=20, center=true, $fn=13);
+  translate([0, 0, 3.8-extraCounterSink])
+    cylinder(r=5.35/2+.2, h=5, $fn=24);
 }
 
 module screw_socket_cone() {
   union() {
     screw_socket();
-    scale([1, 1, -1]) cylinder(r1=4, r2=7, h=4);
+    translate([0,0,-1.5]) scale([1,1,-1]) rotate([0,0,30])
+      cylinder(r1=m3nutRad, r2=m3nutRad+1, h=5, $fn=6);
   }
 }
 
-module vertex(height, idler_offset, idler_space) {
-  union() {
-    // Pads to improve print bed adhesion for slim ends.
-    translate([-37.5, 52.2, -height/2]) cylinder(r=8, h=0.5);
-    translate([37.5, 52.2, -height/2]) cylinder(r=8, h=0.5);
-    difference() {
-      union() {
-        intersection() {
-          translate([0, 22, 0])
-            cylinder(r=36, h=height, center=true, $fn=60);
-          translate([0, -37, 0]) rotate([0, 0, 30])
-            cylinder(r=50, h=height+1, center=true, $fn=6);
-        }
-        translate([0, 38, 0]) intersection() {
-          rotate([0, 0, -90])
-            cylinder(r=55, h=height, center=true, $fn=3);
-          translate([0, 10, 0])
-            cube([100, 100, 2*height], center=true);
-          translate([0, -10, 0]) rotate([0, 0, 30])
-            cylinder(r=55, h=height+1, center=true, $fn=6);
-        }
+module vertexShell(height) { union() {
+  intersection() {
+     translate([0, 22, 0])
+       cylinder(r=36, h=height, center=true, $fn=60);
+     translate([0, -37, 0]) rotate([0, 0, 30])
+       cylinder(r=50, h=height+1, center=true, $fn=6);
+  }
+  translate([0, 38, 0]) intersection() {
+    rotate([0, 0, -90])
+      cylinder(r=55, h=height, center=true, $fn=3);
+    translate([0, 10, 0])
+      cube([100, 100, 2*height], center=true);
+    translate([0, -10, 0]) rotate([0, 0, 30])
+      cylinder(r=55, h=height+1, center=true, $fn=6);
+  }
+}}
+
+module sub2(height,idler_offset,idler_space) {  difference() {
+  translate([0, 58, 0]) minkowski() {
+    intersection() {
+      rotate([0, 0, -90])
+        cylinder(r=55, h=height, center=true, $fn=3);
+      translate([0, -32+1.5, 0])
+        cube([100, 16-4, 2*height], center=true);
+    }
+    cylinder(r=roundness, h=1, center=true);
+  }
+  // Idler support cones.  [no longer putting idler here.  attached to top brace (ab)]
+  if (idler_space < 30*.001) {
+    translate([0, 26+idler_offset-30, 0]) rotate([-90, 0, 0])
+      cylinder(r1=30, r2=2, h=30-idler_space/2);
+    translate([0, 26+idler_offset+30, 0]) rotate([90, 0, 0])
+      cylinder(r1=30, r2=2, h=30-idler_space/2);
+  }
+}}
+
+//use <ext15.scad>;  // Mistumi
+use <ext15ob.scad>;  // OpenBeam
+
+module vertex(height) {
+  difference() {
+    vertexShell(height);
+    sub2(height);
+    translate([0, 58, 0]) minkowski() {
+      intersection() {
+        rotate([0, 0, -90])
+          cylinder(r=55, h=height, center=true, $fn=3);
+        translate([0, 7, 0])
+          cube([100, 30, 2*height], center=true);
       }
-      difference() {
-        translate([0, 58, 0]) minkowski() {
-          intersection() {
-            rotate([0, 0, -90])
-              cylinder(r=55, h=height, center=true, $fn=3);
-            translate([0, -32, 0])
-              cube([100, 16, 2*height], center=true);
+      cylinder(r=roundness, h=1, center=true);
+    }
+
+    //%extrusion_cutout(height+10, 2*extra_radius);  // try more detailed extrusion model
+    // fuzz=0.3 was good fit on OpenBeam
+    translate([0,0,-height/2-1]) ext15(height+2,0.3);
+
+    for (z = [0:30:height]) {
+      translate([0, -7.5-extra_radius, z+7.5-height/2]) rotate([90, 0, 0])
+        screw_socket_cone();
+      for (a = [-1, 1]) {
+        rotate([0, 0, 30*a]) translate([-16*a, 111, z+7.5-height/2]) {
+          // % rotate([90, 0, 0]) extrusion_cutout(200, 0);
+          // Screw sockets.
+          for (y = [-88, -44]) {
+            translate([a*7.5, y, 0]) rotate([0, a*90, 0]) screw_socket();
           }
-          cylinder(r=roundness, h=1, center=true);
-        }
-        // Idler support cones.
-        translate([0, 26+idler_offset-30, 0]) rotate([-90, 0, 0])
-          cylinder(r1=30, r2=2, h=30-idler_space/2);
-        translate([0, 26+idler_offset+30, 0]) rotate([90, 0, 0])
-          cylinder(r1=30, r2=2, h=30-idler_space/2);
-      }
-      translate([0, 58, 0]) minkowski() {
-        intersection() {
-          rotate([0, 0, -90])
-            cylinder(r=55, h=height, center=true, $fn=3);
-          translate([0, 7, 0])
-            cube([100, 30, 2*height], center=true);
-        }
-        cylinder(r=roundness, h=1, center=true);
-      }
-      extrusion_cutout(height+10, 2*extra_radius);
-      for (z = [0:30:height]) {
-        translate([0, -7.5-extra_radius, z+7.5-height/2]) rotate([90, 0, 0])
-          screw_socket_cone();
-        for (a = [-1, 1]) {
-          rotate([0, 0, 30*a]) translate([-16*a, 111, z+7.5-height/2]) {
-            // % rotate([90, 0, 0]) extrusion_cutout(200, 0);
-            // Screw sockets.
-            for (y = [-88, -44]) {
-              translate([a*7.5, y, 0]) rotate([0, a*90, 0]) screw_socket();
+          // Nut tunnels.
+          for (zzz = [-1, 1]) { if ((height<20) || (zzz>0)) {
+          assign(zz=((z<20)?-1:1)*zzz){
+            scale([1, 1, zz]) translate([0, -100, 3]) minkowski() {
+              //rotate([0, 0, -a*30]) #cylinder(r=4, h=16, $fn=6);
+              rotate([0, 0, -a*30]) cylinder(r=4, h=5, $fn=6);
+                cube([0.1, 5, 0.1], center=true);
             }
-            // Nut tunnels.
-	    for (z = [-1, 1]) {
-	      scale([1, 1, z]) translate([0, -100, 3]) minkowski() {
-	        rotate([0, 0, -a*30]) cylinder(r=4, h=16, $fn=6);
-		cube([0.1, 5, 0.1], center=true);
-	      }
-            }
-          }
+          }}}
         }
       }
     }
   }
 }
 
-translate([0, 0, 7.5]) vertex(15, idler_offset=0, idler_space=10);
+
+// add a little extra bracing to the edge to try to keep from warping
+module endBrace(height) {
+br=1.2;
+  translate([ 43.05,57.5,0]) rotate([0,0,60]) {
+    // extend leg a bit
+    hull() { cube([1,4,height]);
+      translate([10,br,0]) cylinder(h=15,r=br, $fn=16);
+    }
+    hull() {
+      translate([10,br,0]) cylinder(h=13,r=br, $fn=16);
+      translate([9,2,0]) cube([2*br,12,2]);
+    }
+  }
+}
+
+// ------------ pad/brim to help sticking/warping on Quelab printer (ab)
+module footTab() {
+x1=13; y1=30;
+x2=5;  y2=40;
+  linear_extrude(height=0.4)
+    polygon(points=[[0,0],[-x1,y1+5],[-x2,y2+10],   [x2,y2+10],[x1+5,y1+10]],
+          paths=[[0,1,2,3,4,0]]);
+}
+
+module vertexPad() { color("Cyan") {
+  translate([0,-3,0]) scale([2,1,1]) cylinder(h=.4,r1=16.3,r2=16,$fn=6);
+  translate([ 25,34,0]) rotate(-33) mirror([1,0,0]) footTab();
+  translate([-25,34,0]) rotate( 33) footTab();
+  linear_extrude(height=0.4)
+    polygon(points=[[16,10],[35.6,44.2],[-35.6,44.2],[-16,10]],paths=[[0,1,2,3,0]]);
+}}
+
+// =======================================================================
+
+vertex(15);
+//intersection() { cube([25,25,20],center=true); vertex(15); }
diff --git a/vertexB.scad b/vertexB.scad
new file mode 100644
index 0000000..c3f19f5
--- /dev/null
+++ b/vertexB.scad
@@ -0,0 +1,112 @@
+//use <ext20.scad>;
+use <ext20v.scad>;
+
+module vertexBframe(thick) {
+t2 = thick+2;
+  union() {
+    difference() {
+      intersection() {
+        hull() for(a=[0,120,240]) rotate([0,0,a])
+          translate([0,-68,0]) cylinder(r=6,h=thick,$fn=36);
+        translate([0,0,-1]) hull() {
+          translate([0,-50,0]) 
+            scale([16,8,1]) cylinder(r=1,h=t2+2,$fn=64);
+          translate([-75,40,0]) cube([150,4,t2]);
+        }
+      }
+
+      // clear out main interior V
+      hull() {
+        for(a=[-1,1]) { translate([22*a,-13,-1]) cylinder(r=8,h=t2,$fn=36); }
+        translate([0,45,thick/2]) cube([130,1,t2],center=true);
+      }
+    }
+
+    // diagnostic ruler.  We want about 36mm between front of nema17
+    // and front edge of extrusion
+    %translate([0,-9,9]) cube([2,36,t2*2],center=true);
+
+    for(a=[-1,1]) {
+      hull() {
+        translate([cos(30)*68*a,68/2,0]) cylinder(r=6,h=thick,$fn=36);
+        translate([54*a,21,0]) cylinder(r=1,h=thick,$fn=6);
+      }
+    }
+  }
+}
+
+// brace across vertex.  custom sizing
+module braceRail(thick) {
+t2 = thick+2;
+  difference() {
+    translate([-55,-15,0]) cube([110,27,thick]);
+
+    translate([0,0,-1]) {  // make all subtractions a little wide to make sure it is a clean cut
+      hull() {
+        for (a=[-1,1]) { translate([38*a,17,0]) cylinder(r=12,h=t2,$fn=36); }
+      }
+      hull() {
+        for (a=[-1,1]) { translate([24.5*a,-10,0]) cylinder(r=10,h=t2,$fn=36); }
+      }
+      for(a=[-1,1]) { translate([54*a,-7,t2/2]) rotate([0,0,-30*a])
+        cube([20,50,t2],center=true);
+      }
+    }
+  }
+}
+
+module m3hole(thick,fuzz) { cylinder(r=2.94/2+fuzz, h=thick+2, $fn=11); }
+module m5socketHead(len,fuzz,counterSink=0) {
+  union() {
+    translate([0,0,-0.03]) cylinder(h=len+0.03,r=4.88/2+fuzz, $fn=13);
+    translate([0,0,-5-counterSink])
+      cylinder(h=5+counterSink,
+        r1=8.5/2+fuzz+(len+counterSink)*0.02,
+        r2=8.5/2+fuzz-0.1,
+        $fn=24);
+  }
+}
+module m5slotNut() {
+  translate([0,0,-1.6/2]) cube([10,15,1.61],center=true);
+  cylinder(h=1.4,r=7/2,$fn=36);
+}
+module extrusionAnchorCutout(z,fuzz) {
+  translate([0,-52,z]) {
+    translate([0,6.6,0]) rotate([ 90,0,0]) m5slotNut();
+    rotate([-90,0,0]) m5socketHead(10,fuzz,2);
+  }
+}
+
+module vertexB(thick,fuzz) {
+  difference() {
+    union() {
+      vertexBframe(thick);
+      translate([0,5,0]) braceRail(thick);
+    }
+
+    translate([0,0,-1]) {
+      translate([0,-37,0]) ext20(thick+11*0.2,fuzz,2);
+
+      // M3 drill holes
+      for(a=[-1,1]) {
+        translate([19*a,-31,0]) m3hole(thick,fuzz/2);
+        translate([39*a,  3,0]) m3hole(thick,fuzz/2);
+        translate([59*a, 34,0]) m3hole(thick,fuzz/2);
+
+        //smooth outer ear transition
+        translate([44*a,28.4,0]) cylinder(r=10,h=thick+2,$fn=60);
+      }
+    } // end of z=-1 shift for subtractions
+
+    // extrusion anchor screw(s)
+    if(thick < 21) {
+      extrusionAnchorCutout(thick/2,fuzz);
+    } else {
+      extrusionAnchorCutout(      9,fuzz);
+      extrusionAnchorCutout(thick-9,fuzz);
+    }
+
+  } // end of difference   
+}
+
+vertexB(1?16:45,0.2);
diff --git a/vertexC.scad b/vertexC.scad
new file mode 100644
index 0000000..f694dc5
--- /dev/null
+++ b/vertexC.scad
@@ -0,0 +1,152 @@
+// vertex for use with OpenBuilds v-slot 2mm extrusion towers,
+// and 15mm extrusion braces
+
+use <ext20v.scad>;
+use <ext15ob.scad>;
+
+
+module vertexCframe(thick,fuzz,extCutout=true,motorHole=true) {
+t2 = thick+2;
+  difference() {
+    hull() {
+      for(a=[-1,1]) translate([12*a,-12,0])
+         cylinder(h=thick,r=10,$fn=36);
+      translate([0,58,thick/2]) cube([127,2,thick],center=true);
+    }
+
+    // extrusion guide
+    if (extCutout) {
+      for(a=[-1,1]) {
+        translate([-20*a,-3.5,0]) rotate([0,0,30*a]) {
+           translate([0,0,7.5])
+              rotate([-90,0,0]) ext15(100,0.15);
+           if (thick>33) translate([0,0,thick-7.5])
+              rotate([-90,0,0]) ext15(100,0.15);
+        }
+
+        // remove slot guide from other 3 sides
+        translate([-24*a,-5.82,-.5])
+           rotate([0,0,30*a]) translate([-8,0,0])
+              cube([16,90,thick+2]);
+      }
+    }
+
+    // motor shaft area cut-out
+    if (motorHole) hull() {
+      for (a=[-1,1]) {
+        translate([12*a,24,-1]) cylinder(h=t2,r=8,$fn=36);
+        translate([20*a,35,-1]) cylinder(h=t2,r=6,$fn=36);
+      }
+    }
+
+    // screw tab cut-out
+    hull() {
+      for (a=[-1,1]) {
+        translate([30*a,52,-1]) cylinder(h=t2,r=6,$fn=36);
+      }
+      translate([0,65,thick/2]) cube([90,2,thick],center=true);
+    }
+
+    // --------- extrusion cut-out
+    translate([0,0,-1]) ext20(thick+11,fuzz,2);
+
+    // M3 drill holes
+    for(a=[-1,1]) translate([30*a,41,-1]) m3hole(thick,fuzz);
+
+  }
+
+  // diagnostic ruler.  We want about 36mm between front of nema17
+  // and front edge of extrusion
+  %translate([0,28,9]) cube([2,36,t2*2],center=true);
+}
+
+module m3hole(thick,fuzz) { cylinder(r=2.94/2+fuzz, h=thick+2, $fn=11); }
+module m5socketHead(len,fuzz,counterSink=0) {
+  union() {
+    translate([0,0,-0.03]) cylinder(h=len+0.03,r=4.88/2+fuzz, $fn=13);
+    translate([0,0,-5-counterSink-5])
+      cylinder(h=5+counterSink+5,
+        r1=8.5/2+fuzz+(len+counterSink)*0.02,
+        r2=8.5/2+fuzz-0.1,
+        $fn=24);
+  }
+}
+module m5slotNut() {
+  translate([0,0,-1.6/2]) cube([10,15,1.61],center=true);
+  cylinder(h=1.4,r=7/2,$fn=36);
+}
+module extrusionAnchorCutout(z,fuzz) {
+  translate([0,-14.8,z]) {
+    translate([0,6.6,0]) rotate([ 90,0,0]) m5slotNut();
+    rotate([-90,0,0]) m5socketHead(10,fuzz,2);
+  }
+}
+
+module m3extHole(fuzz) {
+  translate([0,0,-8])m3hole(9-2,fuzz);
+  cylinder(h=8,r1=5.5/2-.1,r2=5.5/2+.4,$fn=24);
+  translate([0,0,-10])
+     cylinder(h=5,r2=5.5/2/cos(30),r1=5.5/2/cos(30)+.4,$fn=6);
+}
+
+module e15nutAccess() {
+  hull() {
+    cylinder(h=6,r=3/cos(30),$fn=6);
+    translate([5,0,3]) cube([1,6,6],center=true);
+  }
+}
+
+module extMountHoles(t2,f2) {
+  for(a=[-1,1]) translate([0,0,t2]) {
+    translate([-22.5*a,24,0])
+       rotate([0,0,120*a]) rotate([90,0,0]) m3extHole(f2);
+    translate([-38.3*a,52,0])
+       rotate([0,0,120*a]) rotate([90,0,0]) m3extHole(f2);
+  }
+}
+
+module vertexC(thick,fuzz) {
+  difference() {
+    vertexCframe(thick,fuzz);
+
+    // extrusion anchor screw(s)
+    if(thick < 21) {
+      extrusionAnchorCutout(thick/2,fuzz);
+    } else {
+      extrusionAnchorCutout(      11,fuzz);
+      extrusionAnchorCutout(thick-11,fuzz);
+    }
+
+    extMountHoles(7.5,fuzz/2);  // extrusion mount holes
+    if (thick>33) extMountHoles(thick-7.5,fuzz/2);
+
+    // slot access cutouts
+    for(a=[-1,1]) {
+      translate([-18.7*a,-6,   -6+4.5]) rotate([0,0,90+30*a]) e15nutAccess();
+      translate([-18.7*a,-6,thick-4.5]) rotate([0,0,90+30*a]) e15nutAccess();
+    }
+    translate([-26.5,-10,7.5]) rotate([90,0,90+30]) e15nutAccess();
+    translate([ 21.5, -7,7.5]) rotate([90,0,90-30]) e15nutAccess();
+    if (thick > 33) {
+       translate([-26.5,-10,thick-7.5])
+          rotate([90,0,90+30]) e15nutAccess();
+       translate([ 21.5, -7,thick-7.5])
+          rotate([90,0,90-30]) e15nutAccess();
+    }
+  } // end of difference   
+}
+
+vertexC(1?15:45,0.08);
+
+use <support.scad>;
+
+color("Cyan") {
+  for(a=[-1,1]) {
+    supportPillar(19.2*a,-5.5,4.4);
+    translate([15.6*a,0,0]) rotate([0,0,-30*a]) zigZag(66,2,6.2,2);
+  }
+  translate([-22.5,-6.6,4.6]) supportPillar4(0,0,3,2,5.8, 30);
+  translate([ 25.5,-6.6,4.6]) supportPillar4(0,0,3,2,5.8,-30);
+  translate([ 1,-17,3.2]) supportPillar4(0,0,2  ,4,8.6);
+  translate([.8,-10,5.4]) supportPillar4(0,0,1.6,4,4.4);
+}
diff --git a/wheeledCarriage.scad b/wheeledCarriage.scad
new file mode 100644
index 0000000..24b7a4f
--- /dev/null
+++ b/wheeledCarriage.scad
@@ -0,0 +1,261 @@
+include <configuration.scad>;
+use <beltCatch.scad>;
+
+separation = 40;
+thickness = 6;
+
+horn_thickness = 13;
+horn_x = 8;
+
+belt_width = 6;
+belt_x = 5.6;
+belt_z = 7;
+
+// Parameters for wheeled base
+base_thickness = 11;
+wheel_radius = 8; // delrin wheels
+extrusion_width = 15;
+wheel_offset = 18;
+m3_head_radius=5.4/2+0.2;
+boltSep = 8; // tension bolt seperation half-dist
+
+module carriage() {
+  // Timing belt (up and down).
+  translate([-belt_x, 0, belt_z + belt_width/2]) %
+    cube([1.7, 100, belt_width], center=true);
+  translate([belt_x, 0, belt_z + belt_width/2]) %
+    cube([1.7, 100, belt_width], center=true);
+  difference() {
+    union() {
+      // Main body
+      hull() {
+        translate([-9.5,-15,-.5])         cube([19.2,30,1]);
+        translate([-9.5, -8,thickness-1]) cube([19.2,16,1]);
+      }
+
+      // Ball joint mount horns.
+      for (x = [-1, 1]) {
+        scale([x, 1, 1]) intersection() {
+          translate([0, 0, horn_thickness/2])
+            cube([separation, 18, horn_thickness], center=true);
+          translate([horn_x, 0, horn_thickness/2]) rotate([0, 90, 0])
+            cylinder(r1=14, r2=2.5, h=separation/2-horn_x);
+        }
+      }
+
+      // side support
+      for (i=[-1,1]) { hull() {
+         translate([ 9.8*i,-7.5,12]) scale([1,2,1]) rotate([0,0,22.5]) cylinder(h=1,r=2,$fn=8);
+         translate([ 9.8*i, 7.5,12]) scale([1,2,1]) rotate([0,0,22.5]) cylinder(h=1,r=2,$fn=8);
+         translate([ 9.6*i,-18,0]) sphere(2,$fn=8);
+         translate([ 9.6*i, 18,0]) sphere(2,$fn=8);
+         translate([14*i,0,0]) cylinder(h=1,r=3,$fn=6);
+      }}
+
+      translate([2.1,-8.1,3.5]) rotate([0,0,180]) beltCatch(9);
+      translate([2.1, 8.1,3.5]) mirror([1,0,0])   beltCatch(9);
+
+      // belt catch support/fill
+      translate([ 3  ,-24,3.5]) cube([4,48,3.5]);
+      translate([-1.6,-16,3.5]) cube([6,32,3.5]);
+    }
+
+    // Screws for ball joints.
+    translate([0, 0, horn_thickness/2]) rotate([0, 90, 0]) 
+      cylinder(r=m3_wide_radius, h=60, center=true, $fn=12);
+    // Lock nuts for ball joints.
+    for (x = [-1, 1]) {
+      scale([x, 1, 1]) intersection() {
+        translate([horn_x, 0, horn_thickness/2]) rotate([90, 0, -90])
+          cylinder(r1=m3_nut_radius-0.2, r2=m3_nut_radius+0.5, h=8,
+                   center=true, $fn=6);
+      }
+    }
+  }
+}
+
+
+module wheelAxleBrace() {
+  //hull() {
+  //  cylinder(h=1,r=5,$fn=36);
+  //  translate([0,0,base_thickness-3]) cylinder(h=6,r1=5,r2=3.7,$fn=36);
+  //}
+  intersection() {
+    cylinder(h=base_thickness+3,r=5,$fn=36);
+    translate([0,0,4]) scale([1,1,3]) sphere(5,$fn=36);
+  }
+}
+module wheelAxleHole() {
+  translate([0,0,-30]) cylinder(h=60,r=m3_wide_radius,$fn=12);
+  translate([0,0,base_thickness-1]) cylinder(h=10,r=m3_head_radius,$fn=30);
+}
+module mobileWheelMount(dilation) {
+bthick = base_thickness + 2*dilation;
+  difference() {
+    union() {
+      cylinder(h=bthick,r=6.5+dilation,$fn=24);
+      translate([0,0,bthick/2]) rotate([0,90,0]) hull() {
+        translate([0,-boltSep,0])cylinder(h=10,r=bthick/2,$fn=6);
+        translate([0, boltSep,0])cylinder(h=10,r=bthick/2,$fn=6);
+      }
+    }
+    if (dilation==0) { // this is the ACTUAL mount, not a socket, add screw holes
+      translate([0,0,-2.2]) wheelAxleHole();
+      translate([0,0,bthick/2]) rotate([0,90,0]) {
+        for (i=[-boltSep,boltSep]) {
+          translate([0,i,-3]) wheelAxleHole();
+        }
+      }
+      // move to main #translate([-8,-6,-.1]) cube([3.5,12,1.3]);
+    }
+  }
+}
+
+module cableCatchBrace() {
+  hull() {
+    translate([0, 1.5,12.4]) cube([12 ,3  ,1  ]);
+    //translate([ 2, 5,11]) cube([6.5,1  ,2.5]);
+    translate([13,-.5, 5  ]) cube([8,6,5]);
+  }
+
+  // flat pad for stop switch
+  %translate([4,-7,5]) cube([12,7,5]); // flat pad for stop switch
+  hull() {
+    translate([7.5 ,4,7.5]) rotate([90,0,0]) cylinder(r1=3,r2=2.1,h=9,$fn=15);
+    translate([18  ,4,7.5]) rotate([90,0,0]) cylinder(r1=3,r2=2.1,h=9,$fn=15);
+    // some extra bracing
+    translate([13,0,3]) rotate([90,0,0]) scale([2,1,1]) cylinder(r1=4,r2=1,h=1,$fn=22);
+  }
+
+  // more bracing for under belt catch
+  hull() {
+    translate([-6,-6,14]) sphere(2,$fn=22);
+    translate([-10,2,14]) cube([11,1,1]); 
+    translate([-8,4, 4]) sphere(1,$fn=18);
+    translate([-1,1,14]) sphere(2,$fn=22);
+  }
+
+}
+
+module wheelBase() {
+dx = extrusion_width/2+wheel_radius;
+supportSpread = 6;
+  difference() {
+    union() {
+      for (i=[-wheel_offset,wheel_offset]) {
+        hull() { // main wheel axle screw holder pair
+          translate([-dx, i,0]) wheelAxleBrace();
+          translate([-dx+10,(i<0)?i+9:i-9,8]) cylinder(r=2,h=1,$fn=6);
+        }
+      }
+
+      // tension screw housing pair
+      translate([0,0,base_thickness/2]) rotate([0,90,0]) {
+        for (i=[-boltSep,boltSep]) {
+          translate([0,i,-20]) cylinder(r=4.2,h=41,$fn=36);
+        }
+      }
+
+      // brace section for mobile mount 
+      //%hull() { // brace section for mobile mount 
+      //  translate([ dx- 9,-16,.03]) cube([15,32,base_thickness]);
+      //  translate([ dx-20,-12,4]) cube([11,24,base_thickness-4]);
+      //}
+      hull() {
+        translate([dx+6,-16,base_thickness/2+0.01]) scale([1,1,base_thickness/2]) sphere(1,$fn=36);
+        translate([dx+6, 16,base_thickness/2+0.01]) scale([1,1,base_thickness/2]) sphere(1,$fn=36);
+        translate([   6, 16,base_thickness/2+0.01]) scale([1,1,base_thickness/2]) sphere(1,$fn=36);
+        translate([   6,-16,base_thickness/2+0.01]) scale([1,1,base_thickness/2]) sphere(1,$fn=36);
+        translate([-4,0,10]) rotate([90,0,0]) cylinder(r=1.5,h=14,$fn=24,center=true);
+      }
+
+      // brace between main fixed wheel axles
+      //%translate([-dx-2,-16,0]) cube([ 7,32,base_thickness]);
+      hull() {
+        translate([-dx+2, wheel_offset,6]) scale([1.5,.1,3]) sphere(2,$fn=36);
+        translate([-dx+2,-wheel_offset,6]) scale([1.5,.1,3]) sphere(2,$fn=36);
+      }
+
+      // fill in little middle-underside gap between braces
+      //translate([-dx+2, -6,base_thickness*0.55]) cube([ 9,16,3]);
+
+      // extra bracing from belt catch to mobile mount rails
+      translate([0,-15,1])                 cableCatchBrace();
+      translate([0, 15,1]) mirror([0,1,0]) cableCatchBrace();
+    }
+
+    // Adjustable tension screw holes
+    translate([0,0,base_thickness/2]) rotate([0,90,0]) {
+      for(i=[-boltSep,boltSep]) {
+        translate([0,i,-24]) {
+          cylinder(r=m3_wide_radius,h=60,$fn=12);
+          cylinder(r1=m3_nut_radius+.4, r2=m3_nut_radius-.2, h=7, $fn=6);
+        }
+      }
+    }
+  }
+}
+
+module wheelBaseHoles() {
+dx = extrusion_width/2+wheel_radius;
+  translate([-dx,-wheel_offset,1]) wheelAxleHole();
+  translate([-dx, wheel_offset,1]) wheelAxleHole();
+  translate([dx-6,0,0]) mobileWheelMount(.3);
+  translate([dx-2,0,0]) mobileWheelMount(.3);
+}
+
+module earBrace() {
+  intersection () {
+    hull() {
+      rotate([0,55,0]) scale([2,1,1]) cylinder(r=.4,h=7,$nf=12);
+      linear_extrude(height=0.1)
+        polygon(points=[[0,0],[7,1.5],[7,-1.5]], paths=[[0,1,2,0]]);
+    }
+    translate([-2,-5,0]) cube([10,10,10]);
+  }
+}
+
+module mobileSupport() {
+  for (i=[26,30]) {
+    intersection() {
+      translate([i ,-8.2,-0.4]) rotate([0,5,-90]) scale([0.8,0.6,0.8]) earBrace();
+      translate([i-2,-17,.3]) cube([4,8,4]);
+    }
+  }
+}
+
+use <endstop.scad>;
+%translate([0,34.4-2,6.5]) rotate([180,0,0]) endstopCarriage();
+
+difference() { union() {
+  difference() {
+    union() {
+      translate([0,-5+5,base_thickness-.4]) mirror([1,0,0]) carriage();
+      wheelBase();
+    }
+    wheelBaseHoles();
+  }
+  translate([23+5,0,0.05]) mobileWheelMount(0);
+
+  color("Cyan") {
+    //%hull() {
+    //  for (i=[-wheel_offset,wheel_offset]) {
+    //    translate([-extrusion_width/2-wheel_radius,i,0])
+    //      cylinder(h=0.4,r=6.65,$fn=24);
+    //  }
+    //}
+    //%translate([9,-17,0]) cube([23,34,0.4]);
+
+    // support material, forced
+    translate([ 17.3,0,base_thickness+.9])                 scale([0.5,0.6,0.7]) earBrace();
+    translate([-17.3,0,base_thickness+.9]) mirror([1,0,0]) scale([0.5,0.6,0.7]) earBrace();
+    translate([5,-1.5*0,.1]) {
+      mobileSupport();
+      mirror([0,1,0]) mobileSupport();
+    }
+  }
+}
+translate([-8.5, -20,-.1]) cube([17,60,1.3]); // extra clearance for extrusion rail
+translate([ 19 ,-7.5,-.2]) cube([ 5,15,1.4]);
+//translate([ 8.5,  -6,-.2]) #cube([ 5,12,1]);
+}