Hello, it's a simple Rig fan Holder with 63° angle for a good cooling,

Need two screw M4 40mm for a standard 120mm Fan and two screw M4 20mm or 10mm to hold the holder at the rig

Print in PLA with little support for the hole
Buse 0.5mm
Infill 20%
50mm/s / 80mm/s

Creality

Ender 3

Doesn't Matter

Yes

0.2

20