MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
It's not a usable bearing, I printed it as a demonstration piece just to show people as I mostly print flanges and mounts which people find pretty boring. The "spools" have no retainer which allows the surfaces to touch and since they are spinning counter to each other that's double speed and you get immediate heat build up and distortion. I tried to spin mine on a drill press and keep it cool with some silicone lube but it still sticks and grabs. Sorry.
https://www.thingiverse.com/make:360269 This one is 608 sized and works a lot better
https://www.thingiverse.com/thing:620185 This one works well too but is an odd size.
https://www.thingiverse.com/thing:2375124 This one works the best but is much larger.
All the best to you!