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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Another printer smartley moves its Z-Motors to the bottom of the bot. Well played :) I am also a fan of driving the Z axis with a single motor, using a belt system to turn both rods at once.

The SeeMeCNC H-1 printer does this, and it seems to work like gang busters. I am not sure if their design is open source or not though.