http://www.zwsoft.com/forum/viewthread.php?tid=928 I have imported a number of basic SWx parts and assembled them. However one of the parts which is actually about 170mm long, zooms to an 11600mm zoom extent. I have searched for aberrations but cannot find any. Any ideas how to resolve this? or why it should happen? mudcrab 2011-01-23 16:00:00 http://www.zwsoft.com/forum/viewthread.php?tid=928&pid=5149 Paul, You can send the file to me. Use zw3D@zwcad.com. I will be attempting to answer all questions this week since it is Chinese New Year and the GZ support team is on Holiday. LynchMikeVX 2011-01-31 08:37:20 http://www.zwsoft.com/forum/viewthread.php?tid=928&pid=5148 It is probably going to be a tiny, detached stray face, but it could be logically included as being a member of the model (solid). A simple fix is to copy only the geom you want to another Root Part Object, via Edit/Copy/Geometry to Part. You may need to explode the solid in order to rid it of the stray (Copy the faces to a new Root Part Object, sew them in that new Part). ChrisW 2011-01-31 05:07:22