What causes this issue

Since a week I notice that printing bins result in a weird effect on just one side. That is, the corner of the seam. No other corners. Orinting speed is standard. Slowing down or speed up don’t seem to affect this issue

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Post more photos, show slicer screenshots, a photo like this doesn’t help.

I assume this is one of the sides… maybe belt tension… but like already said, not much information.

Nothing special about the slicer settings. Just printed the default makita macpak bin 1x1.

Just one printed two weeks ago and 1 last week. All bins printed the past few days have this issue.

Problematic bin good side
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Problematic one bad side
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Good bin
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What do you guys need for screenshot of my slicer?

Using standard 0.4 nozzle 0.20mm print. Petg filament

I got this problem when the temps was to high and the aux fan blows heavy. Open the door and disable the aux fan helps for me.

Adjust your belt tensioner and then redo the input shaper calibration

It looks pretty good for the most part. Seems like it’s on the inside where the overhang begins that maybe a speed change occurs and/or fans change so you begin to see some kind of change occurred to mark the part differently. You can see on the slicer if the speed or cooling changes.