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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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The springs are homemade from steel wire. I describe how I made them in the instructions. Another thingiverse user made his from 1.75mm PLA by designing and printing a mandrel, wrapping the filament around it, and submerging it in hot water.