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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Have you considered shifting the handle to one of the wheels, rather than the gear between them? It seems like the mechanism would "feel" backwards, in this configuration. I like the general design and its simplicity, however. Nice work on the gears, as well.

Now we know what the Mythbusters square-wheeled truck should have driven on – nothing but speed bumps!