Horizontal deviations on flat walls

I don’t think this is the same issue as Gridfinity horizontal line at wall transition - #10 by dave.p because the deviated areas occurred at a specific height and sides.

The top one printed with Classic wall generator, bottom one is with Arachne wall generator. The opposite sides ( the rear and left side of the bed ) printed fine in both prints.

I’ve printed many similar shapes without issues. BTW, the wall thickness is even in the deviated areas. Any idea what could have caused this?

How is the flatness on the bottom of that corner?

I’ve seen similar issue caused by warping.

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It’s PLA, no warping issue there. I suspect it has something to do with the belts…

It’s possible, and since it appears at the same layer (at least in the pictures), it would be the Z belt.