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Feature_request: temperature_fan PID which use actual (chamber) heater power as PID input variable #788

@Schmudus

Description

@Schmudus

I have a Sovol SV08 max and added recently the Sovol heater. It uses one of the fans and it is separately controlled.
I found that it is not good/necessary to run the heater fan all the time with high speed, it can even cool down the chamber. In the original Sovol macro the heater is at watermark control which make it more bad. Then you realy can have cold air blowing through the heater. We don't want cold air during ABS or ASA or some other filaments.
So I put it on PID control which worksds quite good but at the same time I found that it would be very helpful if I could have a kind of temperatutre_fan but instead of chamber temperature it should use the actual heater power. From my testing I found a range from 40 to 90% fan for this heater is quite good anf give always nice warm air inside the chamber.
I tried to do it with some makros but it was not sucessfull because the mactros don't run during PRINT_START or if a print is running. So I guess it need to be hard coded but I'm not able to do that.

So basically a temperature_fan which uses a heater instead of a temperature.

Thank you guys!

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