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 should take another tip from TheRuttmeister and have the small gear shaft grow to a larger size; that would give much more fit for the nut without having to change the gearing ratio... it will be done -- eventually. :) I'm on a mad path to a particular goal here.