Hello,
i developed a little “extra” python module that uses an additional Fan and a Thermistor (or other temperature sensor) to heat the chamber up.
The idea is not new but i did only find macro based solutions to control the fan:
One or more fans moving air under the heatbed and transfer the heat into the chamber.
(if done properly you can smelt down the plastic parts in you chamber 
)
Whats the difference to a macro based solution?
Not much…
- It shows up like a real chamber heater, including output of current and target temperature-
- Does wait for the bed to reach its target temperature before starting the fan, to avoid bed heater errors (I had this all the time when i started from cold)
- it needs one simple config section
- no complex startup gcode to heat up, somthing like M140 S100; M191 S50; M109 S240 (or
M140 S115; M191 S50; M104 S240; M190 S100; M140 S240 to do it a bit faster/smarter)
Current features:
- Supports M141 (set chamber temperarture) and M191 (set chamber temperarture) gecodes
- Controls temperature while printing w/o infering with the print (less than 1° cooldown of the bed, air is cirulated as slow as possible to hold the temperature)
- Waits for bed reaching its target temperature before the fan is started.
Planed:
- Using the control classes from pheaters (BangBang and PID) to control the fan speed instead of my KISS code.
- Using a compartment fan to cool down the chamber when overheated
- Complete documentation
- Some checks and failure when temperature cant be reached (e.g. difference chamber / bed temp is below a certain level on M191)
For me, the current version is enougth…
Are there people here that want this extra?
I will spend the time to make it perfect if the community is intrested and the additional time is not wasted.
mo