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 those of you concerned about printing the ducts with the overhangs high up in the print...
I printed the dual 5015 duct with Cura's experimental tree supports and support set to "touching buildplate" as @mediaman advises. The support structure stays only on the buildplate, but branches out to hit the overhangs (like a tree, as one might imagine)... see the blue in attached pic. Came out great, support was a bit difficult to start removing but once a couple areas broke away the rest of it came out easily in one big chunk.