I was looking for a improved part cooling fan for my Ender 3, but I liked the stock look more than the big boxy ducts or tall designs that were out there. Seemed like overkill for me. I felt the 4010 fan was sufficient if room could be made to make a better flowing duct.
I really liked the housing design from xxricsxx, and it created significant space by raising the extruder fan high enough to fit a smooth part cooling duct beneath. So I remixed it to accomodate one fan, with a more compact and angular look, then made a new cooling air duct that should flow a little better.