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.
Thanks for your feedback according the use of flexible filament. On Nov 4th I answered crunchtime2k's comment about decreasing the inner hole to match the radius of the drive gear. It's just a small change in the OpenSCAD file that can be done by hand easily, but I'm going to add a parameter the next few days... Btw, would you mind posting an image of your print?