It would be nice to have some options that allow for usage with bad meshes - i.e. 2 parts placed overlapping eachother, that externally look good. But currently, are processed as a void where the overlap is.
For example, this piece: https://www.thingiverse.com/thing:3905351
The paws are inset into the base, and s3d processes the slicing as an empty space such that the base and the figure on top aren't actually connected. It would be useful to have some sort of mesh overlap functionality here in case those voids aren't intended.