Bresser Rex Mainboard Fan Upgrade

For Bresser Rex, Flashforge Adventurer 3 etc......

To install a better 24V low noise 50 x 50 x 10 fan for the mainboard.

Size 170 x 194 mm

I think, 2mm is enough, but may be 3mm is better.

edit: that is better! https://www.thingiverse.com/thing:3638974