Simple to print fan housing for Creality CR-10 to use axial fans for both hotend cooling and 2-sided part cooling.
a) 40mm fan for hotend cooling and 40mm fan for part cooling
b) 50mm fan for hotend cooling and 40mm fan for part cooling
Print face down and only generate supports touching the build plate.
I accidentally printed this without supports and it was sort-of OK too but if you try this use line pattern, not concentric.
Requires a collection of M3 bolts and nuts.