So I went back to try a few models. First of all, it doesn't seem to work with Firefox anymore. Whenever I try to upload a model from within Firefox, it just aborts, so I tried Internet Exploder, and I can upload some models, but not others.
The resulting repaired STL is not a normal STL. I can't open it in anything (MeshLab, NetFab, MeshMixer, RH. It has an STL extension, but I'm not sure what's inside it.
In fact, MeshLab says premature end of file reached, so it could be a corrupted download.
I'll try a couple simpler one tonight.
To print or, 3D print, that is the question...
SD3 printer w/too many mods, Printrbot Simple Maker Ed., FormLabs Form 1+
AnyCubic Photon, Shining 3D EinScan-S & Atlas 3D scanners...
...and too much time on my hands.