Hi gr5! Thank you for the advise, but don't think this is the issue.
The model is exactly the same for all of these 8 adjustments screws, out of which 4 are sliced incorrectly. If the problem was in the model, I would suppose I had problems in all of them.
I printed similar batches (albeit with smaller diameter holes) with Cura v2, without any issues. The "CAD" is Microsoft 3D Builder, which sometimes make strange things, but here the hole looks perfectly clean (see Figure).
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gr5 2,224
My guess is you used sketchup. This happens a lot with sketchup models. If you are using sketchup:
Look at your model - especially inside that hole in the center. Look for *any* walls that are gray instead of white. Make them all white by right clicking and select "reverse faces". Anything that shows as gray will confuse cura into thinking that's the "solid" side of a wall. Most other CAD software doesn't have this issue - just sketchup.
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