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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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Maybe a light sanding of the threaded rod would help. Initially, the fit was tight for mine as well, after working the nut on the thread for a few minutes, it loosened up to the point where it spun freely on it's own.