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NEMA 17 to 40mm Fan Adapter

by ChrisMagno, published

NEMA 17 to 40mm Fan Adapter by ChrisMagno May 3, 2012
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Summary

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.

Instructions

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.

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On my NEMA 17, the motor snugs up so close to the back that no air can escape through the angled vents. It just blows back through the spacing in the fan around the fan blades.

Mar 1, 2016 - Modified Mar 1, 2016

Why is there not 4 inlets but just 3 if you pass the motor cables through an inlet rather than the rectangular opening originally designed.
I have tried all ways to fix that design on the motors, but in vain. I think there is a really design issue.

Edit: definitely a design issue. Someone has corrected it
http://www.thingiverse.com/thing:35436

NEMA17 Fan Mount

I just made one myself but.. How do you attach it to the motor itself? Thanks!

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.

Thanks for answering Chris!
I got it, but how to you attach this [fan + adapter] kit to the motor?
Thanks again!

sorry, i misread your original question. This was designed to attach and stay on with friction. for mine, I pressed them on the motor, and they stayed on snug.

No problem Chris! That's what I thought. On my motor it is very loose, I'll try to use some kind of tape. Thanks!

I don't know if anyone else is having this problem, but this object won't slice properly in Slic3r. The printed object has gaps in the walls and in the vent guides (not joined together) and there is a noticeable ridge on 2 of the vent guides. I thought it was my printer at first, but my gcode analyzer shows those same defects in the gcode. Still a usable part if you glue the walls together.

Sorry to hear you are having problems. I just downloaded both STL files, and Netfab is showing them as manifold. What version of Slic3r are you using?

Just finished designing some of these myself :) must remember to seach here first next time.

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