Nema 14 40mm fan adapter
thingiverse
A straightforward method is provided to attach a 40mm fan with ease to a RepRap's (or any NEMA14 motor) extruder motor. Channels along the motor facilitate airflow across its surface. However, this method remains untested at present. Here are the instructions for you: print them out, securely screw on the fan, place it over the motor, and finally turn on the fan to enjoy the cooling effect.
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