prusa i3 - How can I add an extra fan, controlled by a microcontroller, to my board? - 3D Printing Stack Exchange
Automatically turn the Fan on when Extruder is on · Issue #3234 · MarlinFirmware/Marlin · GitHub
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BUG]Part Cooling Fan not Running - after clicking on Menu it starts with 100%, not adjustable - SKR Mini E3 V2 · Issue #20670 · MarlinFirmware/Marlin · GitHub