Just a long shot… but check the driver setting (if any) make sure they are set to the the recommended by the manufacturer.. this is my system , it has the dip sw setting that are recommended on the stepper motor… Long shot but, if it gets changed… could be an issue…
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NoahAuthorI just swapped wiring on x an y and no change. So I looked at some spar stepper motors and the were smoother turning by hand. So I replaced the motor and the x-axis is near perfectly quiet! Wonderful. I have been working on this motor forever.
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