Hi Jim, do you have some example files with the problematic booleans that you could post here or e-mail to me at moi@moi3d.com so I could check them out?

One thing that can help is to avoid making a flow where the deformed result just barely skims right along some overlapping surface area on the target object, make the cutting object sunken down a little bit into the base plane so that it pushes some distance through the other object rather than just barely skimming it.

- Michael

Hi Michael, I've tried with my latest model and that works fine in V3 and have also tried to go back to what I thought I did but haven't managed to get it to fail again.

Come to think of it the subtracted objects would have been very close to at least one surface so I expect your comment could explain what went wrong.

In future I'll keep the files for you.

Cheers - Jim