The shape shows as solid in SketchUp and Solid Inspector 2 says it’s solid but Simply3D shows many errors.
Here’s a screenshot and the SketchUp file for the solid shape:
Wine Glass_solid group.skp (1.6 MB)
Here’s an image of what the shape looks like in Simply3D:
I’m not really optimistic about anyone being able to help me. If I can’t fix this I’ll have to stop using SketchUp and try using some other 3D modeling software that doesn’t have these problems.
I really would appreciate the attempt to help me since I have already had a great deal of help here on this forum.