This is an OnShape model exported to STL with the default options, then imported into KM on grid.space. (I did this to isolate a different problem.) In the OnShape integrated version the problem does not occur, although it looks like the tessellation quality is also different between the two so that might be the real issue.
Do you mind testing older versions of KM to see if this is a recent bug? I’m on a flight and testing is difficult. Thanks for the workspace. I will debug when I can.
I’ve found something puzzling … if you set the slicer “detail” to anything other than 50 in preferences, these artifacts go away. will dig deeper, but at least there is a workaround.