I have an issue with a Y-shift every few lines only when printing multiple items at once. If I print the exact same models individually, they each print fine. Notice the shift only happens a few times, about every 4 lines, and then stops happening.

I’m printing PLA on an Ender 3 Pro, slicing with Cura 4.8 (Mac).

Any ideas on how to troubleshoot?

Annotated image of both multiple and single prints Failed print on bed Two towers showing Y-shift Closeup of failed print showing layering

  • $\begingroup$ have you tried printing the part rotated by 90° around Z? I suspect it is a mechanical thing, the nozzle getting snatched by the print in a hole as it moves.... $\endgroup$
    – Trish
    Jan 3 '21 at 23:49
  • $\begingroup$ I suspected a mechanical problem as well, perhaps a loose grub screw on a shaft. $\endgroup$
    – fred_dot_u
    Jan 4 '21 at 0:04
  • $\begingroup$ I will check these items; thanks for the suggestions. $\endgroup$
    – dlehman
    Jan 4 '21 at 4:59

I initially tightened the tensioner for the x-axis belt pulley, which seemed to help. Then I double-checked my installation, and realized the belt for the x-axis was on upside down (belt teeth go in, smooth side of belt out).

So I guess it’s actually more surprising it’s been working well until now...

  • $\begingroup$ I guess that means it was also an X-axis layer shift, not a Y-axis one. $\endgroup$ Jan 5 '21 at 4:17
  • $\begingroup$ Yes, sorry, 3D-printing newb (obviously). "Never believe what the user tells you", right? ;) $\endgroup$
    – dlehman
    Jan 6 '21 at 14:43

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