Thanks for speedy response with the pipebend software I export a solid - the dxf is just for creating the path way.

Same dxf in both programs to create the solid - and the MOI exports work 90% of the time. Its really quick designing tube parts in MOI much quicker than designing the same part in Solidworks. From the error in the pipebend software its like it cant read the ends on this particular file and its usually the same error. Maybe something how the ends of the shape are completed into the solid.

I have had a look at both solids in Rhino and there is differences on how the the solid shape is created.

In Moi I usually create the path and then run the PIPE script. I have also tried drawing in the circle at the start of the curve to get Sweep but doesnt seem to make much difference.

See what you think.