Hi Sander. Marlin disables the extruder from working unless you heat the hot end up to 170C or higher. This is to avoid damaging things - usually you simply get a grinding of the filament but sometimes the bowden pops off.
So either heat up the print head to 180C or you can build a version of Marlin that has this safety feature disabled.
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illuminarti 18
Have you heated up the nozzle? There's an interlock in the firmware that prevents the extruder turning when the nozzle is below a threshold temperature - iirc, it's 170ºC.
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