Ender 3 fan mount for Z stepper-motor

During longer prints, the Z-axis stepper motor gets pretty hot (above 40° Celsius). One issue is the wrong positioning of the stepper motor, but this can be fixed with some spacers (https://www.thingiverse.com/thing:2925230). This reduces the friction at the lead screw but at the same time prevents the Z-motor from dissipating its heat to the aluminum frame.

To tackle this problem I decided to mount a 40mm fan to the motor. Here you can find a fan mount that screws on top of the Z-axis end-stop-switch. (You just need new screws that are about 5mm longer than the original ones and of course some screws to hold the fan itself on the mount.)

I also recommend you to cover the fan so that nothing can get sucked in. I printed this fan grill cover: https://www.thingiverse.com/thing:2802474