Skewed prints? Bad calibration? Layers shifting? Weird issues?


Check the setscrews that hold pulleys to the motors shafts.

In my case one of them (Z axis) was loose and this caused knocking during calibration, rattles, bad levelling, skewed prints and layers shifting. The screws use no thread locker I think and I would recommend unscrewing them altogether, positioning the holes on the shafts notch and screwing them tight with thread locker in (especially that they have 1.5mm allen head and you cannot put very much torque on them).