Easy Print 40mm Fan Duct for Ultimaker

by Glasswalker, published

Easy Print 40mm Fan Duct for Ultimaker by Glasswalker Mar 31, 2012


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This is a fan duct I designed for my ultimaker. I needed a fan duct and a new fan, all I could source locally was a 40mm fan. And the other 40mm designs out there were designed in a way that the thicker high-rpm fan I ended up with wouldn't fit under the X carriage block when homing the X axis.

This design is inspired by those other designs, but revised to account for my needs. Hopefully someone else will find it useful.

I completely redesigned this one with several goals in mind:

  • Supports thicker fans without worry of it hitting anything on the machine during operation
  • Takes a 40mm fan, and ducts it in a 360 degree way around the nozzle while not cooling the nozzle itself too much
  • Easy to print, no overhangs, should be a super easy print to do well.
  • Structurally robust. Many others I printed sagged when the PLA warmed up, either causing the blower end to touch the nozzle, or to sag into the print. This one is structurally robust, and it adds ziptie hooks on the top to help support the motor weight.

Works wonders for me, I hope it helps you too.


Print vertically (as the STL is arranged) so the fan flange is flat on the print bed.

There are some thin parts in the blower "donut" so that's the most difficult part, as long as your slicer supports proper slowdown and such to allow the parts to extrude clean, it shouldn't be a problem.

Mount your fan using M3 screws, just screw directly into the plastic, it's just slightly small so should allow you to thread into it and tighten it well

Mount on the 2 lefthand side M3 long bolts on the extruder head. The wide vertical protrusion should sit flat against the aluminum plate

Use a ziptie or two from the upper part of the same M3 bolts, to the outside edge of the ziptie loops on the top of the duct, (use the outside rather than the inside so it doesn't get in the way of the X block)

Tighten the ziptie only enough to ensure the bottom surface of the duct stays perfectly level with the print bed (and a couple mm above where the nozzle tip is).

Enjoy good cooling!

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Note that the v2 hot-end is slightly lower than the v1 hot-end.

I used a couple of M4 nuts as spacers and that seems to be perfect.

Also, the nut on the side where the long screw goes into the fan shroud is a total pain to install (if you need to use a spacer nut, especially). Given that this is for a 40mm fan, I would suggest moving the duct to the middle a
nd allow the screw+nut to be on the outside on that side.

Also, wire tie loop tends to hit the bolts on the X axis block. I ended up cutting off the left hand wire tie loop and just using the right one. Worked fine.

Awesome fan duct. Been working really well (until I melted it -- but I've sinc
e printed a new one).

Hello, nice design, i printed one after burning the stock shroud on my heated bed. It was not so easy to print (at last for me, probably because of my improper settings and was printing fanless). Anyways, it has been working like a charm until I received the new ultimaker hot end v2 (which of course occurred only a few days after my successful print).

Any chance you design a version compatible with hot end v2?



I'm using this, as is, with the v2 hot-end. It requires a couple of spacers to lower it just slightly. I've found that m4 nuts seem to be perfect. I'm hoping the fact that the aluminum plate in the v2 hot-end is supposed to run cooler will prevent the shroud from warping. You can see the spacer nut if you look closely at the image I posted for "I Made This!".

Nicely done! I'll need to mirror it left to right (my extruder is in the front-let corner of the assembly), but that should be easy.

What did you design this with?

Yeah I figured some might need to mirror it. Or simply mount it on a different side (in your case the front left would mean mounting it on the rear, which is the one side it won't work on lol)

Should be fairly easy to mirror in almost any slicing software though.

I design 90% of my stuff in Sketchup. I occasionally use 123D or Solidworks. And I also use OpenSCAD sometimes. I'd say 90% of the time is Sketchup, 9% OpenSCAD and the rest for the others.

This particular file was designed i
n Sketchup (to directly answer your question) lol.

Thanks! Let me know how it works for you. I'm printing with it right now, and it's working great for me. (Printing my revised printable eggbot http://www.thingiverse.com/thing:20398http://www.thingiverse.com/thi... )

Revised Fully Printable Eggbot

(I wish Thingiverse had a "let me know when someone comments on a comment" feed).

Thanks for the details. Interesting.