Prusa i3 MK2 Nozzle Fan Upgrade

by Druckbaer, published

Prusa i3 MK2 Nozzle Fan Upgrade by Druckbaer May 24, 2017


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Hello lovers of the Prusa i3 MK2,

after upgrading the extruder fan with the thing from JKSniper (https://www.thingiverse.com/thing:2076234) which reduced the noise level of the printer a lot there was still the noisy nozzle fan. Therefore I had to do something!

After the good experience with the Noctua fans I decided to design an additional fan adapter for an 60mm fan (60mm because the air flow of the 40mm version was lower than the flow rate of the stock radial fan)

I use this fan and it worked perfectly quiet (50 cm away from the printer just 40 dBa):

You could buy it from the official noctua ebay shop: http://www.ebay.de/itm/232161938203?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Keep attention that you order the FLX which is the 12V Version!

The complete fan adapter consists of three parts:

  • the adapter itself
  • a changeable air outlet (first idea was to make a circular outlet around the nozzle) so you can create your preferred outlet and just change it
  • the fan cover which is screwed on the adapter to laminate the not so pretty color of the fan

Unfortunatly i deleted all CAD files except the ready sliced gcode files. BUT those first prototypes fit perfectly at the first try and everthing worked as supposed!

To attache the adapter to the extruder body you can use some shorter M3 screws from the spare. For attaching the cover onto the adapter i recommend 4 pieces of M3x35 screws

Have fun with a real quiet Prusa i3 MK2(s) :)

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Printer Brand:



Prusa Mk2









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This design is absolutely bittersweet.

I love the design, and had one on my printer for months, until I started printing with ABS.

So now my first one is warped to shit, and I can't print a new one in ABS because its already in gcode (for PLA)

I tried baby sitting my printer for 3 hours...but I got Distracted for 5 minutes, and missed a transition where the temp dropped to 200c and the fan started up, right around 89%. Ended up with a stringy mess nearly 10% from completion...

i have tried gcode converters to no avail, end up with random offshoot parts not related to the actual model.

infuriating. but awesome design. GAH!!!

I have gone into the Gcode and edited some of the text lines...maybe then i can print it out with ABS...

beautiful looking thankyou already installed it


Thanks for the design.

How did you connect the fan wires ? (red/black etc)

Also did you solder the fan wires to the "old" fan wires or is the new cable long enough?

As for the small fan on the side, how is your experience with it ? I plan to print PETG and NEGEN (240°) does this fan have issues ?
As there is a debate about static pressure in the prusa forums...

Thanks a lot!

Hello Chrunch,

I just cut the yellow wire of the fan very near to the fan and soldered red to red and black to black, which I cut from the stock fan. The old wires are long enough so you have not to extend it :)

I have no Issues with any of the fans. What is the debate about? what are the concerns in detail?

Hi Druckbaer,

Thanks for answering.

Well thing is that the noctua does not push the air with so much force around the hotend cooling cylinder as the original fan does. This leads to ca 5 k more temp in the hotend and the cooling down time is longer. (Static pressure of about 1.9 and the original fan has 4.1 or something). It is the same amount of air tho but the speed so to speak is slower.

The most concerns are melting Extruder parts do to the slower cooldown and hotter temp. However some fear a fire hazard.

I think it should be fine there are so many people using the nocuta fan. If there where significant problems someone would raise the issue in the prusa forum.

So i just wanted to hear your experience as I intend to print with hight temps like 240 and so on. And maybe many ppl just print PLa with 80....

Also check out my design of a 60mm fan duct for the prusa: https://www.thingiverse.com/thing:2462570

Nozzle Fan 60mm Prusa i3 MK2S Upgrade

As this fan is designed to cool the part, not the extruder, this should have no impact on any safety aspects. When printing ABS Im not using the nozzle fan at all, and that is printing on 255, so I don't think there should be an issue as it can clearly cope with 255 with the nozzle fan off. I do not have this thing, but just talking generally.

Dou! for those stl files.

Imo, part where fan is mounted, it needs some optimization for flow / noise.
It does not match perfectly fans inner diameter and edges should be rounded.

Thanks anyways!

I have a request.. vill you pleese send me screenshots of your slicer settings?

Hello Mini,
I sliced it with simplify 3D and i am not able to the the Settings when Open the gcode in the Programm. pls just give it a try:)

Whoah - kinda huge! :) Still - JKSniper approved :P

Gcode files are kinda useless. Everyone has different temps and print settings in their slicer.

As I Write in Description I have lost all the stl files. But if you have a prusa i3 mk2 and that would be the only reason why you would use it, you can copy it to your SD Card and print. You will not Need a slicer.

I hope you can get back with the .stl files. looks promising!

I have tried a recovery but no Chance :/ I will definitly not be able to reconstruct it as good as the printed prototype fits.