Hi Steve I had a question about your PCB's kits that I bought from you. I'm sure I read it somewhere already but of course I can't remember. Does you board already correct the motor wire so you don't have to swap the blue and green wires around?
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My board provides two 4-pin connectors to support both motor types. If the motor is jittery with one port, simply switch to the other port.
If you use the CNC Shield V4 board, then you have around a 75% chance that it will work and a 25% chance that you have to swap the wires.