40mm extruder cooling fan

by erossman, published

40mm extruder cooling fan by erossman Oct 17, 2012
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Printrbot compatible extruder fan duct and mount. This fan duct primarily cools the hot extruded thread. This ducting provides some additional cooling for the extruder collar/mount as well. Design DOE's and optimizations by me. The wonderful CAD work on these were provided by my friend Eric D., as he is so much faster at CAD work than I am.


I have three variations of Extruders for my project that I used for fit during this design. The duct mount is meant to fit between your x-carriage mount and your extruder drive. You can attach the fan ducting on the top or bottom of the mount tabs to fit your exact dimensions. The primary cooling output is meant to cool the hot extruded output and not the nozzle. Assure that the ducting does not extend below the extruder nozzle. The secondary cooling output (to the extruder collar/mount)is optimally spaced to be within a half of an inch (~13mm).

Support ribs were specifically incorporated into the design to allow non-cooled printing of these parts, control flow, and to provide additional strength to the ducting.

Enjoy :)

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I get a lot of back flow using a 40mm Noctua fan and it doesn't feel like anything is coming out of the end. Fan is facing the correct direction and it seems to be making a different in my prints. Could it be that the inside is so rough that it is creating turbulence? Or is it just that these little fans don't generate a lot of flow to start with?

I've printed this, and it looks nice. I'm probably being stupid, but can't figure out how to attach the fan. Do I use self tapping screws? Not sure how to keep the nuts on inside the duct.

I used small self tapping screws, I added extra wall thickness in the design for this.

Great design work, looks lie you thought hard about it :)

Can aou upload a 50mm version?

I also would love an 50mm version :-)

This was probably obvious to everyone else, but don't print this with PLA - it will soften and sag in use from the heat of the hot end.

I've printed two of the brackets now - one in PLA and one in ABS and you don't need the supports (I removed them because they were not printing on the first layer and causing issues).

Not so, I have had no problem using this part printed out of PLA. And I am printing polycarb @ 230°F. I run an insulated hot end though. My testing has shown that the fan shroud is just as effective at 13mm as it is at 3mm, so you could try increasing your spacing from the hotend. My current problem is the flow is uni directional to the part making single wall shells a challenge. I am looking to rework this fan shroud mount to give the option of mounting two fans. Thank you for your feedback

OK, just made one.

I have a few comments:
The added support (thank you!) is not, at the first layer, connected to the base. My extruder knocked some of them over that sticked to the extruder head. It printed OK though.

The duct is printable without a fan, but I had some layers split... it's usable but i think I'll use this one to print another if it works well :)

The legs of the breakaway supports can be improved with some additional brim. I will see about adding a base layer to help the supports print better as well. Thank you for your feedback. :)

No problem :) The silliest thing is that when I was done printing and mounting it, I realized my fan was 50mm and way too thick.
I feel rather stupid now. At least I was able to give some feedback.

Will this fit a printrbot plus? :)

I printed mine on a plus, And mounted it. fits just fine

I believe that the exact same hotend and extruder are used throughout the printrbot model lineup.

-Eric :)

For what machine is this meant? does it work with laser cut extruder rigs?

On the mount bracket, my solid infills for the 45degree tabs are being fickle. I would suggest adding support structure when slicing the mount. I will have an update soon