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For questions related to the usage of fans on 3D Printers for the cooling of electronics *not* the print
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Marlin (on RUMBA board) switch extruder fan automatically
The RUMBA board has two fan outputs. The primary fan output is switched by pin 7, the secondary one by pin 8. The reason your fan is not working when you set #define EXTRUDER_0_AUTO_FAN_PIN 8 is becau …