I've seen a lot of models on here that are great but need work to be more printer friendly..lot of inverted triangles..bad shells. I try to clean them up to a point that most printer software when doing its shitty auto-repair it won't turn it into garbage. Still, most of these are really only suitable for extruders, SLS (sintering) prints or polyjet. This would be a nightmare in any kind of SLA style prints.
mostly watertight printable....(trapped volumes can't be fixed without going back to parasolid) Or spending a million years in Materialize magics which I don't feel like doing. enjoy!