My original fan duct broke. I've got HICTOP 3DP-11. I couldn't find a fan duct here that I liked. At first I just glued my old one back together. But I finally got some time to model one up. I present it here for your use.
I was able to print it without supports by positioning it with the ring down on the print plate and the duct sticking straight up. It printed without support in PLA