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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.

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I've added the rings and got some improvement, although I couldn't quite fit the 3rd ring on without rubbing up against the bracket. I'm still only at 1 minute, though. What bearings did you use for the balance?