@marinoter Good evening,Sorry for my late reply. Apparently, I had it wrong in my mind. It wasn’t P10, but P2 Sorry for being to hasty, i wasn’t able to double check the right Pin-Number, because of a business trip. So, the right command should be “M42 P2 S255” to turn on the fan and “M42 P2 S0” to turn off the fan.In fact, I mixed up the command for the fan and the light. With "M42 P10 S0", you can switch off the LED-Light inside your Witbox 2.But this works only if the Light is set to "on" in the settings of the printer itself.I hope this works for you now. Other side facts about the M42-Command in Marlin-Firmware: marlinwiki/M42 Best regards, Marvin