Unpredictable layer shift on brand New Vcore

Hi ! This freshly built vcore 300 is displaying some weird, inconsistent layer shift all the way through the print. I checked the Z coupler and X/Y pulley, tensioned the belt. The printer moves fine, feel fine, extrude fine and the part is solid but its useless. I'm looking for clue to where to start the debugging process as I never had this kind of issue. The printer also run Rat OS with the exact same config file as 4 other machines which print fine. #
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2 Replies
mobzi264
mobzi2648mo ago
Update : even after re-tightening the pulley they still moves. Will retigthen them (again) and try again
Max
Max8mo ago
Have you made sure that one of the grub screws on the pulley is pushing against the flat side of the stepper motor shaft?
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