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.
For you bros doing this in Slic3r, I had great luck with supports on and overhang threshold set to 2 degrees. Will just generate supports on the long floating areas where the fan nozzle goes in.
Thanks for the awesome design!