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My extruder motor can get hot after extended prints, even with the current dialed down. I needed a thing to cool the motor and did not find a thing that met my needs.
This is a simple adapter to mount a 40mm fan at the back of your NEMA 17 to cool your hot motor.
I created the ducts to direct air over the the 4 sides, and away from the hot end or the print.
I have 2 types of NEMA 17 motors. One has the wires going into the motor housing, and thus bend around any duct in this Thing. The Second Motor has a more ridged backing where the wires enter the motor.
I created 2 versions of the same thing. If your motor has what I call "soft wires" going into the thing, please download the STL Fan_Adapter_4_soft_wire. If your NEMA17 has a more rigid wire keeper, then please use Fan_Adapter_5_solid_wire
The holes were designed for 3mm. To mount the fan, I used 6-32 without a nut. The slight size difference allows for the screw to self tap into the ABS. Otherwise use 3mm screw, and nut
Choose a length of screw that protrudes 1/4" or 3mm past the inside of the adapter. This will act as a spacer to better allow the air to pass over the base of the motor and through the ducts.
NEMA 17 to 40mm Fan Adapter by ChrisMagno is licensed under the Creative Commons - Attribution license.
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