I have been a long time Prusaslicer user but lately I’m running into a limitation. Hole XY size compensation is a big missing feature which I have seen in Cura. Also Cura handles lithophanes really well.
I do not like the UI of Cura but do like the Prusaslicer one.
What slicer do you prefer?
I’ll go ahead and say prusa meets my needs and it is what I’m using on arch. Maybe I’ll try orca based on this thread. I don’t even understand your problem so I suspect you are a more sophisticated user!
Vertical holes are much narrower than horizontal ones even though they have the same size in the model. This is because plastic flows inward and also because it doesn’t draw perfect circles.
A good slicer can compensate for that by making vertical holes a bit wider.