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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.