I was trying to share the stl file for my 3DP Cage mast when I got the error mentioned above. Maybe 12MB is too big?
When I select my file. The progress bar fills up and when it gets to the end I get this pop-up window. (See screen shot)
Stls are an allowed filetype and the upload limit should be much larger than 12mb, so that shouldnt be a problem :/
It liked the Zip file. I've never used Mint's compression app to make a zip before, though. Can anyone open it?
OK that's odd. I just unpacked it in a different folder and checked it with meshlab and slic3r. Both say it's a valid manifold. What tool did you use?