Hi Sean, here's the other fixed up one attached. This one was a trimming boundary problem, somehow one of the edges in the model isn't there, probably another bug in some previous geometry operation but unfortunately I can't figure out where just by looking at the final result.

I fixed it by deleting the bad faces which were all around the missing edge, making new ones with the help of a line drawn in where the missing edge was at and then using Edit > Join to glue them back into a solid.

It's possible to repair an object with a couple of busted areas like this by using some "low level" surface operations like deleting faces or using Edit > Separate to detach them, then either doing an untrim/retrim of the damaged face or creating a new one and using Edit > Join to glue them back together. You don't need to remake the entire object this way.

Hope this helps! If you ever happen to catch this problem right when it happens please try to undo and save off the version of the object before it happens so I can try to repeat it over here. I'll need to "catch it in the act" in order to find out what was making the bad result and have a chance at fixing it up.

Thanks,
- Michael

Wow, thanks. I was just hoping for advice, I didn't think someone would fix the parts for me. If the missing face in the smaller part was caused by a random bug what about the distortion in the larger part? The bugs carry over into an stl file. I wonder what would happen if you tried to print them anyway.
Thanks again.

Hi Sean, no problem. If you tried to print them it would probably be rejected by the printer software that takes in the .stl file and generates slices.

The problem in the larger one is also likely to be caused by a bug somewhere but a different one than the other one. I can't really tell for sure exactly what went wrong though just by looking at the end result unfortunately.

- Michael