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.
I'm sorry to hear that you're having problems with the teeth breaking off. Not sure if you've seen this, but I posted some ideas as a comment on this make: http://www.thingiverse.com/make:182887. I'll be sure to post an update if I find a good solution to this issue!