unfold a sheetmetal pipe

Hello, I use afx to create tubes for a frame. Specifically I use sheetmetal pipes to have the outside diameter and thickness I want.

After I trim the tubes that intersect with each other (via profile cut out)  I would like to unfold the tube to make a dxf of the 2d sketch.

However when I open the tube "example_sm_pipe_10_fl.prt" the flat pattern fails to regenerate. What can I do to have the tube unfolded with its cut out?

Thanks!