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This one is turning out to be a real head-scratcher. I'm running a stock Creality CR-10S and there seems to be a single line approx 45° across the print on the X-axis direction.

I have attached images to better explain. Any help would be greatly appreciated.

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    $\begingroup$ This are probably wrong theories, so let's exclude them: Does this anyhow correlate with an infill pattern (here I think of "Infill overlap (%)" setting) or with the starting point of print for the outer wall (a Z-seam, you would need to observe during the print)? $\endgroup$
    – octopus8
    Mar 8 at 19:19
  • $\begingroup$ Do you print Infill before walls? Can you print a copy of that item and abort that print mid-way, showing the infill together with the erroneous area? On the black item, the seams are on the upper or lower edge afaict. $\endgroup$
    – Trish
    Mar 8 at 19:43
  • $\begingroup$ Hi, thanks a lot for the reply. These parts are hollow, and infill for both are concentric. Does it have to do with belt tension or motor vibrations? $\endgroup$ Mar 9 at 2:53
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In your slicer check your z-seam overlap. Lines like that are what happens when a slicer is systematically trying to hide a seam while not adding a ton of time onto the print by adding in a bunch of additional time for travel.

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  • $\begingroup$ This seemed to be the case, I was using matterhacker for slice and print. Didn't have this issue with Cura. Thanks a lot mate! $\endgroup$ Mar 19 at 0:41

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