Wide Mouth Fan Duct for Ultimaker

by owen, published

Wide Mouth Fan Duct for Ultimaker by owen Oct 16, 2012
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This delivers more air than my previous fan duct.
Suitable for V2 Nozzle.
Clearance is 3mm to platform and 2.5mm to heater block.
May be suitable for dual extruders (Untried yet)
Push on and Nut Mounted variety.
Updated Both Fan Ducts May 16/2013 (better wall thickness. Firmer fit for Push on Duct. Old one started slipping after a bit of use)
See http://www.thingiverse.com/thing:77107 for what looks to be a good improvement to my push on Duct.


Best to Print in PLA90 or ABS. This is a must if you have a heated bed.

Print either Nut Mount Duct or Push on Duct

Fan mount holes are made small so you can screw the screws straight into it without a nut too.

Careful cleaning strings around cable guide (It's a bit delicate)

zip file contains the UM model from http://www.thingiverse.com/thing:29513 as well as the Fan Duct. Open All.iam

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is it only for PLS solution? Not for ABS?

Best to print it in ABS, especially required if using a heated build platform.

My first printed version was in PLA and it did melt... while it was printing the next one in nylon! :D

So far so good. The origami stock fan duct was starting to knock my prints off the bed anyway and your design seems more efficient than many others.

I still wonder if an asymmetrical opening would cool the area around the nozzle in a more homogeneous way. I tend to reduce the fan flow with this duct as I got more distortions than before at full speed. Not sure it it is related though, b/c I started using other plastics at the same time and they could warp more than the previous ones.

I use 2 of these and operate both at 50%. I used the wide opening to let more air through and accommodate dual nozzle setups. If you try and guide the air through a small opening you get hardly anything out as these types fans can't supply air at pressure.

Yep, I'll probably print another one also (bulky). I would try to mount the fans in serie (lower voltage), so as not to ask for more power from the onboard regulator.

As for the shape, I was not suggesting to reduce the opening but to round it slightly "around" the nozzle (ie. not a rectangular ie unidirectional flow). Now, the flow could get turbulent and inefficient, dunno.

Yeah I don't think air goes around corners much. It just obstructs your access to the tip. Not sure how your fans will go in series. You can drive them at half speed with M106 S128

works great on v2 hotend... thanks!

In my opinion the best fan duct for Ultimaker on Thingiverse.

Thanks Thingster!

This was my 2nd ever 3d print. Works perfect, prints easily. Thanks :)

Nice Work!!! Congratulations


Hi Owen,
Apparently I bought some odd sized fans thinking they were the same as the original ultimaker ones, I have autodesk inventor but apparently the .iam requires source files for the parts? Do advise!

Thanks =)

Hi bczd
Try the um_0000_top.zip
It contains the whole UM Model, imported from http://www.thingiverse.com/thing:29513http://www.thingiverse.com/thi..., with the heater block slid down so it's more like the V2 nozzle.
Please let me know how it goes.

Ultimaker Solidworks model

Somehow it doesn't read the files from that page, its looking for .iam reference files...
Anyways I imported the stl into sketchup and edited it instead, a tad bit messy with the export but it seems to have worked.

 Sorry it didn't work for you. I'm new to inventor and have learnt heaps recently but still working out how to export stuff. Thanks for your patience. I deleted some other part files that I didn't want to keep with the assembly but didn't delete the parts from the assembly so it was looking for them. I moved the whole folder to another drive to test it and made the appropriate adjustments I think. Please let me know if it works or what error messages you get. The whole assembly is called All.iam now so it should be the first file in the folder.

Oh thanks for that! It opens now! Problem is I've never used Inventor ;p Only used autocad myself, the interface is so different I have no idea where to start. 

Hi Owen, 
I spent some time watching tutorials on youtube and I can finally navigate the software! Managed to edit the model! Will print it out tomorrow and see how it goes =)

 It's hard at the start. Online help is fairly substantial though. Good luck.

Great design, works really well. Printed with regular PLA no bed and no support and came out great. i did have the fan fitted for this print to ensure the print doesn't sag.

This looks great. I would love to design one for my Printrbot. Did you use a 40mm fan?

 no 50mm. You'd have to scale x and y by 80%. Not sure how the rest of it would go though.

How does regular garden variety PLA hold up?  

 I used to print with my old one at 210C which had similar clearance with no problem.
If you have a heated build platform then normal PLA is definitely no go.

Wow, that's nice. What is it designed in? Would you mind sharing the "source" file? I don't have an Ultimaker, and I'd be interested in adapting your design to my printer.

 Hi Laird, It's done in Autodesk Inventor. I tried saving it as a STEP file but it wasn't editable so I've put up the Inventor assembly file. It has other parts from the ultimaker that it references from as well.

Thanks for the new version, I was using your V1 until the V2 hotend was installed and am using a modified version of gijs's for now.   Have you tested this with a V2 hotend yet?

 Yep I'm using it on the V2 hotend.