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 Key-Bak counters the weight of the extruder motor.
It will still work without it, however on my printers, when they finish printing, they'd home to the top, and because of the extruder motor's weight promptly settle down with the still-hot hotend on the freshly printed piece.