[regularfry]

I do a lot of this. Sometimes I do notice PrusaSlicer complaining about the geometry, but I can't remember seeing an instance where the export was broken beyond the slicer's ability to cope with it.

There might be something specific in your workflow that's running into a bug I see though. If you still see problems today it might be worth a bug report.

[regularfry]

Just to add to this: 0.18 was the first version of FreeCAD I ever used. 0.20.2 is dramatically better in several important respects, to the point where 0.19 and even 0.20.0 feel like major regressions if I ever have to open them. It's well worth giving newer versions a try.