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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Hi, I just printed one to give a try, I have to say that this design is promising.
I would mention that additionnaly to the shaft, it would be great to smooth out the cap and nut, it is not really a good user experience to get fingers hurted on the first assembly.
And moreover, add a small chamfer to the gears, on the face in contact with the bed, to minimize the elephant foot impact.
I have done these "improvements" with a file and a grinder for this first version and all the assembly is running perfectly flawlessly.
Unfortunately not tested in real life with the MMU2s yet, I wonder if it will spin quick enough during the fast unloading (not in stealth mode). I currently put a 70g M12 bolt with a T-Nut, from my drill press.