https://forums.autodesk.com/t5/inventor-forum/creating-a-surface-with-deformations/m-p/5886573#M355184 The flat area is a mistake, and the only one with ridges should be the horizontal one.<BR />It's not a sharp edge but it's a small fillet. Fri, 30 Oct 2015 23:16:27 GMT jotta.pedro 2015-10-30T23:16:27Z