Hi AlexPolo,

It sounds like the pipe bender CAM is expecting analytic surfaces like toroids and cylinders rather than freeform spline surfaces. I ran into the same problem a few months back when trying to import a STEP generated by sweeping in MoI into a sheetmetal CAM program. You can solve this by using extrude and revolve instead of sweep. Those commands generate clean analytic surfaces. Of course, it's a lot more work.

- Peer

Thanks Peer I tried to simplify the shape as the outer shape can either sqr or round ultimately the machine doesnt know which tool set you put in but still same problem - here is another part created in MOI with essentially the same components a few 90 degree bends - a few straight sections and 1 large arc this file imports into the tube bend software without problems - strange that it work most of the time but with the occasional file its a no go - Ill keep experimenting see if I can pinpoint the issue.