Printrbot Fan Bracket & Duct

by rickmellor, published

Printrbot Fan Bracket & Duct by rickmellor Aug 1, 2012
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A mounting bracket for a 40mm fan with integral duct that directs cooling airflow towards the extruder tip of a Printrbot 3d printer.


I have a Printrbot LC Plus. This bracket inserts between the extruder and the extruder carriage. The fan is a 40x40x10mm dc fan. You will want a 12v fan to use with the Printrboard that comes with the Printrbot. RadioShack sells the fan, or you can find it at Amazon, DigiKey, Mouser, Fry's, etc. The Printrboard uses a two-wire fan.

There are alignment studs on the bracket for the fan screw holes. I tacked it on with CA glue then ran a bead of RTV silicone around the periphery to make sure there was no bleed air out the sides. Make sure you have the polarity correct when you connect it to the Printrboard. You can easily check to see if the fan is turning the right direction by placing a post-it note to the fan. It it sticks, the fan is blowing the right direction. I find it hard to tell by feeling it with so little airflow.

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I've had mine on my Printrbot for a while and it got a little charred. That can't be a good thing! http://t.co/X4t3x5Vkhttp://t.co/X4t3x5Vk

Holy cow! What was the spacing between this and your Ubis? Does your Ubis have the insulation sleeve on it?

I'm really glad you didn't get a fire. :o

Here is the link.. Again thank you Rickmellor


Printrbot (Updated) extruder fan bracket in mm

Thank you for posting this! I've been traveling and didn't have the files handy. I'm glad you're seeing good results with this.

This duct design stabilizes the extruder output greatly, allowing me to make straight "unsuported" lengths. Great design, very good upgrade. Thank you..

I posted a derivative, that is just a conversion into millimeters. :-D

In slicer
amp; a STL viewer this is tiny, a few mm, can you scale it to real life size?

This webpage says you can scale by a factor of 25.4 to achieve this. I entered 2540% in Slic3r and correctly scaled it.


Slic3r GUI (windows) has a max scale of 1000%, so I scaled it to 1000% saved a stl then scaled that 254%. Looks about the right size, once I print it I'll confirm all is well.

I'm using Slic3r on linux. While the up arrow only goes to 1000%, I was able to key in 2540% and it took it. Dunno if the windows version would restrict that.

I believe I had the units set to inches, which would explain why it's so small for you. See if you can change the units on import. I can regenerate the STL for mm if necessary but it will be a little while before I can get to it. Let me know of you remain stuck.

You can also check your fan, on the side are two arrows, one indicating turn direction, the other indicating airflow direction :)

Rotation is polarity-dependent. If you get it backwards the arrow will point the wrong way.