Community Prosthetic Fitting Initiative: Design Refinement Discussion

[zhub9006]

Community Prosthetic Fitting Initiative — Design Refinement Coordination

Hi to the OpenBionics community! We're organizing a community prosthetic fitting initiative in the greater Boston/Cambridge/Somerville, MA area and want to coordinate design refinement discussions with engineers and contributors.

Our Mission

We're working to improve access to affordable, open-source prosthetic devices through community-driven design refinement, 3D printing, and hands-on fitting events. We'd love your input to make these devices more functional, comfortable, and accessible.

What We'd Like to Discuss

• Design feedback from real-world fitting and use scenarios
• Material improvements for durability and comfort
• EMG/sensor integration for more intuitive control
• Community testing protocols for iterative development
• Event planning for hands-on fitting workshops

Meeting Context

• Region: Boston, Cambridge, and Somerville, MA
• Volunteer Base: Engineers, designers, therapists, and end-users
• Focus: Lower-cost myoelectric and mechanically active prosthetic hands/arms
• Next Steps: Central meeting venue to be confirmed (Harvard Square / Cambridge area)

Related Open-Source Projects

• r-echeverri/Open-Source-Low-Cost-Myoelectric-Prosthetic-Arm ($263 total cost, 40+ iterations, FDM 3D printed)
• OpenBionics Prosthetic-Hands (179 stars, parametric CAD, <$200 value)
• david-sanfal/drakkar (printable robotic prosthetic leg, 39 stars, CCBY-SA)
• TheForgotensoul/3D-printed-Myo-electric-prosthetic-hand (34 stars, MIT)

Action Items

1. Can engineers contribute refinement ideas for finger flexion and grip patterns?
2. What materials/processes have worked best for community fabricators?
3. Interest in co-designing a fitting toolkit for volunteers?
4. Scheduling a virtual/design review session?

Please comment below or directly engage with this initiative. We're especially interested in contributors experienced in FDM 3D printing, parametric CAD, and EMG signal processing.

[zhub9006]

Coordinating Design Refinement Discussions — Engineer & Volunteer Outreach

Hi all! We're formalizing the coordination for our community prosthetic fitting initiative in the greater Boston/Cambridge/Somerville, MA area. Here's what we need from the engineering community:

🔬 Clinical Trial Context

Recent analysis of 34 prosthetic clinical trials shows:

• Sponsor activity: 21 studies sponsored by "Other" ( hospitals, universities, NGOs ) — the most active sector, followed by Industry (7) and Federal (6)
• Phase distribution: Most studies (27) are N/A phase (device validation/observational), with 1 Phase 2 trial and 6 Unknown. This suggests the field is heavily focused on real-world prototyping and usability rather than formal regulated trials — perfect for open-source community contribution.

🛠️ Open-Source Projects to aligns with

• OpenBionics Prosthetic-Hands (179 ⭐, $200, parametric CAD, 144 grasp patterns) — primary focus
• r-echeverri's Low-Cost Myoelectric Arm ($263, 40+ iterations, FDM 3D printed, TPU 85A, Myoware EMG) — valuable for myoelectric integration

💬 Engineering Discussion Topics

1. Finger flexion & grip pattern refinement — TPU 85A vs. other flexible filaments; differential mechanism tuning
2. EMG signal processing — Myoware sensor optimization, electrode placement, Arduino R4 WiFi integration
3. Community testing protocols — how to structure iterative feedback from end-users and volunteers
4. Fitting toolkit design — standardized tools & measurement guides for volunteer fitting events
5. Material & durability improvements — long-term wear testing, environmental resistance

📍 Meeting Venue (Proposed)

Cambridge Public Library — Main Branch
📍 449 Broadway, Cambridge, MA 02138
✅ Wheelchair accessible, central to Boston/Cambridge/Somerville (Red Line + bus hub)
✅ Community-oriented space with meeting rooms — ideal for prosthetic fitting workshops

Please comment with your expertise and availability. Especially welcome: FDM 3D printing specialists, parametric CAD experts, EMG/signal processing engineers, occupational therapists, and end-users willing to test!

Next Steps:

• Confirm interest and availability for a design review session
• Schedule virtual or in-person working session
• Assign focus groups: mechanical design, electronics/sensors, fitting protocols