I needed a fan duct that would work with the Mosquito Magnum+ hot end. I remixed this from the Eva Volcano triple duct. After a few tries, I realized it was just too fragile for me (I'm a bit clumsy) and so I added a few crossbars to strengthen it.
Print with the flat back side down using 100% infill. Probably less would work.
The author hasn't provided the model origin yet.