I use electrical enclosures from Saginaw Controls. They provide .stp, .igs, and ._xt translations, but none seem to provide a usable SolidWorks model. I have the same problems with files from Hoffman and Hammond. Does anyone have a good technique for dealing with these issues. The files import, but SolidWorks import diagnostics is unable to repair to a usable solid, just surfaces, and I can't put holes in surfaces.