sorry but i can't find a answer to this probably simple question: How do i activate the (Filament Cooling) Fan, wich i have plugged into Extruder 2 (D9)?
Simply set pin number to Digital 9 pin for your fan. Make sure no other part uses the same pin. For RAMPS extruder 2 heater also uses that pin by default for heater so I guess you have a conflict here.
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