Manta mk2 4020 fan mod.
thingiverse
I've tested a few designs for a fan duct for my Ender 3, but Boothy's Manta has been the best so far. I wasn't confident with using the tube design for a 4020 fan, so I rebuilt the 5015 nozzles and instead of using support arms, built a front face. Still testing it, so may make further changes.
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