Preform changing shape of part

General Discussion
1

I am having a stangr problem with preform.It is changing the geometry of parts when I load them in.What am I doing wrong? ytou can see the shape of the window frame in rhino6, but when I load it intopreform it changes the width of the window frame

window1
window11215×941 84.9 KB
window2
window21854×812 102 KB

2

I did some more research.The part is changing shape when I export it.So it si rhino6 that is changing the shape of the part not preform

Carl

3

I fixed it by using extractrendermesh and saing the mes as an .stl

Carl