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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Worked perfectly. Made one from PLA on my Lulzbot Taz5 using Simplify3D slicer software. (Love the printer and the software.)
Marvelous widget.

A few tips:
Make the gears first, then make the arms and pop them into the gears as soon as they come off of the heated bed.
The plastic will be still pliable when warm. Warm up the arms with hot water if you still can't pop in the arms.
Lay the gears flat on a hard surface, (like a desk) and push the arms firmly into the hole with the heel of your hand.
Set your printer for ~40% infill. Perhaps give it 5% extra on the extrusion to make sure that the layers bond well.
I used a 0.5mm nozzle and set my printer for a 0.2 layer height.