my problems seem to be caused by some intersecting polygons and stuff. Is there a way to check a model for intersecting polygons? Perhaps by using Blender or some other software/tool/whatever? Any advice?
Its the most reliable and customizable .stl fixing software I use. And I use it a lot.
Magics isn't free, I know Minimagics is though, but I don't think it has the .stl fixing capabilities the full version has. Minimagics should atleast be able to point out the intersecting triangles though.