Thanks Michael

Not sure what was going on, last night, when I tried to Merge the eagle with a solid, it would recreate part of the surfaces that had been trimmed off. So I thought it had something to do with all those control points left over after the trim.

This morning I started from scratch , created a new surface in ZSurf, imported to MoI, trimmed it , made it solid, merged with another solid... all worked with out a hitch :)
I was done in 5mins :)

I can't bee 100% sure I followed the same steps has last night. but was pretty close... :) let's just flag this issue has "user error" :)

Hi Steve, if some of the shaded display is kind of leaking out past the trimming boundaries that usually means the trimming boundary is badly formed somehow, like it's got some kind of self-intersecting loop-de-loop in it or something else like that which is making for an inconsistent definition of what's inside versus what's outside the loop.

- Michael

I'm sure your right Michael.

Today I've made to models, both worked first time. no problems at all :)

Cheers, Steve