In the attached, I have a polysurface that, if I do MergeAllFaces, causes rhino to lock up. I am running the latest production version.
Merge Problem.3dm (3.4 MB)
yeah, it locks up on me as well…
some of the stuff isn’t lining up properly… for example:
it seems like it could be modeled a lot simpler than you have it (lots of unnecessary surfaces in there)… then the final step would be to _Cap it (or some version of working with a single surface for the lid) instead of merging the 8 surfaces you have.
The rotation axis of some of these is a bit off. I saved them in this odd state because they caused such big problems.