Our customer has sent us a new part for manufacture as an stp file. If I view it in DS I can see some odd extended surfaces possible used to contruct the blended features. In e-drawings it looks fine. We will get these CNC manufactured, I am just concerned if these are somehow "real" artifacts" or just something to do with the way the view is shown. I tried saving as rsdocx and re-stp but they remian at least with default settings. Anyone guide me on this please ?