CR-10 / Ender 3 Dual 40mm Part Cooling Fan Ductinator

I was running a Fang fan duct for a while but after considering going to a direct drive setup, the high, top mounted fan would be in the way of the extruder. I took some inspiration from the Ultimaker 2 fan configuration.

The logic behind my design is that big fans running slower move more air, more quietly, than small fans at full speed. For normal printing I run the fans at 50%. But if I want to print fast with a fat nozzle, those I can throttle them up for big fat thick layers.

NOTE: The photos show a Volcano heater block version. This thing is for a standard heater block/stock Creality hot end. I was using a Micro Swiss all metal hot end, and recently installed a clone volcano heater block. The only difference is the Volcano fan duct is longer/taller/whatever.