Attached is a part that I have been making now for many years. I would have at least 500 different configurations of this type of file. Since 2011 SP0.0 (now on SP2.0) I have been having an error with flattening (flat pattern) the part. If i put an unfold then fold into the part, for some reason I cannot flatten to a pattern. Does anyone else have this problem.
Damian Gillespie
The problem is on Tab1.
See the attached image.
Sincerely, there are best practice for sheet metal and you are out of there.