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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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with one rack gear you can store the energy that you need, to drive up one length of the rack. If you print two rack gears and glue them together, you need twice the energy, to drive up the complete legth = twice the energy is stored.
The longer your rack gear is, the more energy you can store with, but at a certain length, the whole construction will become unstable and break.