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At first few layers, each layer has offset to -X/-Y direction base on previous layer. But above ~2mm, it is vertical.

I've checked the printer build that there is no noticeable error in towers. Tried both manual calibration and Marlin auto calibration G33 with z probe.

No idea what's the cause and don't know which part I need to check with.

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Finally I found out that it was caused by not enough torque output by B tower stepper motor. Increasing current didn't work. I replaced the stepper motor and it prints perfectly.

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  • $\begingroup$ How did you conclude it was tower B's stepper that was at fault? $\endgroup$
    – dibs
    Commented Feb 6, 2019 at 5:48
  • $\begingroup$ @dibs I just put my hand to try to stop the slider. $\endgroup$
    – aleung
    Commented Feb 11, 2019 at 4:20

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