hello i am trying to figure out whats wrong with this dual z motor setup, the motor vibrate when at low amp .5 voltage or at .8 voltage . i disconnected the stepper motor from the 8 mm acme screw so the motor are free from any bind and still have the shake after few sec spin. i use a temp power supply of 12 volt 5 amp, i tested with the hot-end on and off same thing. X and Y axis nothing wrong , maybe i little warm after 20 minutes stay on. need help ???.
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