The reason for the model to miss out surfaces is because of the model accuracy when translated from one software to another. Every software has a different engine on which its built. As far as missing surfaces or distortion of surfaces are…"
The problems your having are very common. Most of our business is based on solving those problems. The main problem is each cad system has its own tolerancing. And when you translate into a neutral format (iges, step) that file retains the…"