When I had my Y driver start making a racket... I turned off the power, and started switching cables.... If the problem moves, then you know it is an electronics problem.... if it stays with the axis, it's mechanical.
Never connect or disconnect a cable or go into the box with the power on. There may be other dangers to you or your equipment that I don't know about. CNCer beware.
Please note, I did this on an X2. On an X3, I think the Z motor is a NEMA 34, so I would only switch X and Y if they are the same type motor.
Note also, loose cables have been seen in multiple Syil driver enclosures. Start there.
-Jeff
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