The dxf opened in cambam ok but when i tried to convert to polyline ( the outside of the face) cambam hung. When i treied the same thing in a little line near the ear it converted ok. I think it could be to do with the dxf. Autocad would not open it. At the end of the day post this issue to http://www.cambam.co.uk/forum/ I am sure youy will get a quick and accurate response form iobulls (Andy) or someone more knowegable than myself.