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.
You're looking at the center shaft as the output. It's not. In the drawing the left shaft is the output. The center shaft would be driven between the gears to adjust the ratio. Think of the center more as the gear shifter.