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 had rack and pinion on several previous designs. ( http://www.thingiverse.com/thing:9190http://www.thingiverse.com/thi... ) I'm probably going to go back to a modified version of it.

Printable X/Y Linear Rail