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@rwensley - thanks for this. My cupcake extruder motor (Plastruder MK5 on one of the last Ultimate cupcakes) died and I came across this.

Was only using one of the two relays on the relay board, so I wired the PWM direct to the input B and put a 220uF 25V cap (chosen for being there, not calculated) across it, then wired the output from the relay to the motor. Seems to do pretty well for a few prints so far.