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.
One gear is combined with the parametric involute double helix from Greg Frost http://www.thingiverse.com/thing:3575.
Still need to do some tests with this to find the optimum twist for my application. Many thanks to Janssen for the model