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.
The herringbone on the small gears does not engage the "big gear" or the "big gear wheel side" completely, they appear to only engage 50% of the thread because they point in opposite directions . After putting it together, greasing it and breaking it in a little I think this is actually by design. Seems to work the gears just engage a little differently than then pinion to the spur gear which mates 100% across the surface of the gear. 1.6mm nails worked perfectly as axels too. good recommendation.