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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 found mine on ebay. Here are the links:

http://www.ebay.com/itm/252662032564?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

http://www.ebay.com/itm/391623473880?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

For the larger bearings, I actually found it better to remove the shield and get ALL of the grease out of the inside. They spun MUCH more freely after that.