Ender 3 fan mount for Z stepper-motor
thingiverse
During longer prints the Z axis stepper motor get's 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 of the spindle, but also 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
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