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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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.