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.

  • $\begingroup$ Please "accept" your own answer so it won't show on the un-answered list. (unless you are waiting on a better answer of course. :) ) $\endgroup$ Mar 8 '18 at 19:53
  • $\begingroup$ How did you conclude it was tower B's stepper that was at fault? $\endgroup$
    – dibs
    Feb 6 '19 at 5:48
  • $\begingroup$ @dibs I just put my hand to try to stop the slider. $\endgroup$
    – aleung
    Feb 11 '19 at 4:20

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