Here a test made with Blender modeled and converted to nurbs now the file is a correct solid but with a less precision maybe the best way is to do the holes without trimming but making the solid as a separated surfaces and then join together and making a solid from surfaces.
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I attached several files the clean is without any other geometry ha only surfaces.

Hi sunspeed, what happens if you use Edit > Separate on your objects to break them apart from solids into individual surface objects before doing the export, does that help with your import into your CAM software?

Please let me know if that works and if it does I can make an option for doing that automatically.

re: other objects - those are probably hidden objects. If you do a "Save As" instead of "Export", it will write hidden objects to the IGES file but I think they should be marked as "blanked" objects in the file.

- Michael

Hi Michael, hi pafurijaz,

Thanks a lot for your help!

I tried to separate the solid into faces as Michael recommended and this directly works perfectly!

This forum and the members are magic!!!

Again thanks a lot,

sunspeed