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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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The point of the outside bearings is weight. most spinners use the cheapest possible for those. there is no point printing bearings there since they're not used as bearings to spin anyway. throwing in a marble or actual larger ball bearing would be better along with the printed center bearing.