Reply To: Fusion 360 & post processor

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On mine the red LED3 on the RAMPS board here and here turns on when I start to cut. That is just indicating that one of the power MOSFETs is being driven. Not sure why because those MOSFETs are normally unconnected and only used for a 3D printer configuration to power the heated bed and two plastic extruders. Probably just harmless vestigial 3D printer behavior.

Did you look at your configuration.h file? That is likely the problem.