Hi Burrman

The error comes up with the STP import before getting to Gcode stage so its definitely something in the tangent to tangent structure as the only change I make to the same underlying curve pathway in SW is to lock the tangents - which must mean there is a further degree of tangency that perhaps the PARASOLID engine enables for the PIPEBEND software to read the 3d part.

Thats just my current thinking.