I am baffled. My Z-stepper, upon completing a move up, rotates counterclockwise about 2 degrees-ish. Upon moving down, when it stops, it rotates clockwise about 2 degrees-ish. I tried swapping it to another driver, and it did the same thing. It appears that all the wiring is secure and proper. It is a NEMA 23 175 oz. I have not had issues with any other motor
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