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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Hi StelMex, I haven't tried it by my own, but a MK8 drive gear (11mm length 9mm dia) could work, too. Just search for "mk8 drive gear" on ebay...