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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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Basically a sun gear with something that will fit a 18.75mm shaft. The Outter gear that planets fit in would be 2 inches around. The sun would be around 1 inch . So im guessing the planets be around half inch .