https://forums.autodesk.com/t5/machining-discussions-forum/stock-simulation-error/m-p/6090660#M5296 The part was not "off" by just a few thou, if was fully defined but inches in the x, y and z direction from front, top and right planes of the assembly. I don't know if this is a repeatable -> HSMWorks 2015 R2.38604 Thu, 03 Sep 2015 01:10:31 GMT Anonymous 2015-09-03T01:10:31Z