Shapeways – I found a zip file of a Millenium Falcon at Thingiverse. Uploaded it, waited 5 minutes, turned back and nothing seemed to have happened. Repeated 3 or 4 times.
Finally I unzipped the file. Turned out there were several STL files inside. Tried uploading one of them. Got this from Shapeways:
Oh no! Something went wrong and we couldn’t process your file. Please try again in a few minutes!
Tried another. Got the same.
Tried www.you3dit.com. Turns out I have to create a login before I can even see what it is they do. Typed Millenium into their Search box and ended up at a completely empty page.
Uploaded an STL. Turns out you have to fill in a Title and Description. Then, you have to check: