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.
Considering the simplicity of the methods used to make the bearings in this motor, they work quite well.
The rollers are made from chunks of 3mm filament, the cage is free to rattle around, one of the flat rolling surfaces has standard 3D-printed surface finish, and radial alignment is plastic on plastic. It is natural that they make some noise when running at 2000 rpm.