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.
Those are not proper for this application either and you're attempting to correct the wrong person. I simply used what the creator called for in this case as it's just a tchotchke. If I were actually engineering this there would be thrust washer involved.