Tilted Adapter for Noctua UPGRADE Fan + 2x Fan Cover

by JKSniper, published

Tilted Adapter for Noctua UPGRADE Fan + 2x Fan Cover by JKSniper Feb 1, 2017
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This is TILTED ADAPTER for Nocuta (or other 40x40x10) fan AND matching Fan Covers!

This tilted adapter has 4 benefits:

  • Noctua Fan is REALLY quiet and reliable! You should upgrade!
  • Fan is pumping cooler air (instead of warm from the bed) as it's tilted upwards.
  • Less intake turbulence (no warping on this side of the bed)
  • Full Noctua fan cover compatible, to prevent sickness from Noctua natural colors... ;)

Full Noctua cover has advantage of hiding the entire fan and also allows mounting the fan via rubber pads which are squished together, making the fan quieter.

Front fan cover is just there for aesthetics and there are 2 versions - the round and the square one. It is matched to the noctua fan design.

I recommend printing covers in color, so that hexagons steps-out while making adapter in black. Choose the material that you like and you need. While PLA is fine for this parts, it may be better to use ABS or PETG if you are printing a lot of ABS...

I'm using four M3x20 screws for the fan (cover) and four M3x10* or M3x12 for mounting the adapter in place. For front fan cover I use two M3x25mm.

Note: While I have tested this and proven it works, this is still work in progress until it's verified by more users. I'm also not responsible for anything if you use this parts. :)

PLEASE: Make a feedback with comment and photo!

*"DIYCalan" reported in comments that with new Prusa parts only M3x10 screws fits.


  • 1.2.2017 9:09 - Initial Release
  • 1.2.2017 13:21 - Noctua Cover V3 - thicker wall on all 4 edges
  • 1.2.2017 14:49 - TiltedNoctuaAdapter V4 - shorter screw hole to prevent too thin wall (Thanks wschadow!)
  • 3.2.2017 12:16 - Added photos of ABS printed. Everything OKAY with files!
  • 15.6.2017 20:53 User "bolsoncerrado" reported some get "non-manifold segments detected". Fixed file is attached along with original one. If you got problem with original, use fixed file instead.

Print Settings


Prusa I3 original MK2










No supports needed! Lay parts in correct orientation if they aren't already. I recommend printing the covers in orange and the adaptor in black color. You can also do bi-color print, doing only first 1mm of the cover grill in color. PLA, ABS, PETG will work, for heavy printing and high temperatures use ABS/PETG. On my printer it took around 1h50min to make all 3 pieces.

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STL file for the Noctua grill/cover? The two fan covers posted look like they both go on the parts fan.

Grill is on NoctuaCover file... It's not separate piece.

Ha! Thanks...should have looked closer :-)

No problem, man :-)

Hey JKSniper, this design looks awesome and I'm considering the upgrade.

Due to the countless discussion surrounding it however, I just wanted to know, now that it's many months on since you've uploaded this, if you were still running this and if you've experienced any issues with anything or printing in different types, specifically ABS as people consistently call out? Thanks

Hey! I'm successfully using this upgrade since february, thats hundreds of hours of printing. I'm printing a lof of ABS in my enclosure, which sometimes gets up to 50°C and heatbed of 105-110°C. I have NO problems whatsoever regarding heat-break cooling with this fan and this option. Also a lof of my friends didn't report any problems using this upgrade. I think you are safe to upgrade it. :)

Thanks for the speedy reply! That sounds great, I'll be ordering one straight away and print this in the meantime. Thank you!

Trying to discern the difference between the regular adapter and the non-manifold-fixed version. Can't find comments or notes about it anywhere. Any guidance?

Some people have asked about the 40mm fan @ 20mm depth. I made that change (better safe than sorry ... right?) and the remix for the deeper fan can be found here:


Noctua Cover @ 20mm

Yeah. Already done it dude. Look in the remixes. Also 3 comments down.


Noctua 40x40x20 Cover

Ah! Haha crack up. I should've uploaded when I made it! Haha apologies

Hey. Love the upgrade, currently testing out some ABS prints of these on my mk2s, but seem to be getting small gaps in the honeycomb pattern. I've tried several different attempts but cannot figure it out. Any ideas? Thanks

Fan cover initial layers
Fan cover finished

you can tweak print width a bit to get optimal surface without gaps. Also a bit more extrusion and a bit more squished print on the bed could help you out.

Hey, used your cover on both my prusa's but wondered if you intend or could you modify it for the 40x40x20 noctua? i have a couple and going to install them instead

Your a month too late dude lol.


Noctua 40x40x20 Cover

Ah! Haha crack up. I should've uploaded when I made it! Haha apologies

That's really cool! Well I could try to make 40x40x20 version also. What do I need to change - only the cover?

Yes please. I've not tried to remix it yet. Thought it be easier for you

just did this mod on my 1 week old Original MK2S but with Noiseblocker BLACK Silent Fan XM2 40mm, the cover has to be 1.3mm shorter for it.
I did some research today as I was concerned with the thermic of the Extruder heat sink and measured the temperature and I get 35C on the last two bottom fins, printing PLA 200C extruder / 55C heat bed
The fan has 3,88 CFM = 6,70 m³/h, so looks like it is OK (for now)
And I was going to order the Noctua today, even the 20mm.

I'll do ABS print test with higher temp as I'll print the cover in Original Prusa Orange ABS, will see.

I stucket 2nd Noiseblocker BLACK Silent Fan XM2 on top of the 1st one and got temp dropped by 3-4C to 30C w/o extra noise.

Just printed the things and installed the fan. All I can say is that this is a MUST if you want to keep the noise level down. I thought I didn't hook up the wires correctly because I couldn't hear the fan turn on!

The design fits perfectly! Thank you for sharing. This is currently my favorite Mk2s mod!

Love the whole concept here, just ordered my Noctua fans. I got 2 questions

Will this work for my Anet A8?
And could you maybe upload a cover which fits the 40x40x20mm fans?

Hey! I'm not certain. You should try it and report. I don't have Anet A8. I might make another cover for 40x40x20 fan, but it will take some time.


Could you make two versions of this, what has a bit less and a bit more tilt angle?

My brand new noctua is keeping some bad noises now or then sometimes, would be nice to know that is angle causing this before I do warranty claim for fan it self.

Sorry, but it's too much work to make another angle just for Noctua test :). You should dismount it, try it in your hands if it makes noise when it's not attached. But I think you have too much or too little screw tension on whole adapter (all 8 screws). Try to tighten more and check and try to untighten and check.


I have tinkered with this issue for many nights, tried everything from double side tape to mount fan.

It cannot be simulated on hand, can be heard only when hotend moves left.


Local store is way out off stock for those fans.

Maybe you printed really thin grill and it's resonating when moving? Nobody reported any problem yet, so it must be something different with your printhead or the way you printed adapter. You can maybe try removing the adapter grill and checking for the noise...

Oh now I saw the video. Check if the noctua fan blades are bent or if bending the blades can make any difference. clearly the blade is hitting noctua housing when moving left and that is making the noise. You can also send A BIT of noctua blade if you can observe which blade is problematic... it's weird problem though - noctua shouldn't make that.

Thanks! I have added this file and made changelog. I've never seen this problem before and it wasn't reported before... Strange :)

This time it wasn't that critical.... but sometimes non manifold items make the item unprintable :)

Jure, thanks for this design, too!
I am more or less ready to install this.
However there are a couple discussions if the noctua fan has the same (or more) static pressure than the stock fan. Some people report that the noctua fan does not run on 100% on the Prusa i3 MK2.
You are running your mod, right? Did you experience any problems?

Hey Woozzel! I'm running this mod for more than 200h. Based on pictures on facebook 3D groups, I'm sure that more than 500-1000 users are already installed this mod and there was NO report that this has any issues or flaws.

Thanks for your response.
OK, thanks I'll give it a try. Silence for the win.
Thanks for this great design!

Good luck! :) I'm sure you will be happy with the result :)

Isnt adding grids in front of the fans reducing the sucked airflow "optimally speaking"?

Grids are actually at some distance to fans (check how they are designed and there is really low airflow in the vent suction area. I believe there is no difference with grids or without.... But I like grids because they prevent some misprinted parts or some "noodles" to get inside the fan directly. :)

Does it work for the MK2s as well?

I think MK2s has everything the same around this fan, so yeah - it works for MK2s aswell.

Just a quick question, can we use the 40x40x20 instead and is it usefull ?
Thank you !

yep you can! just use the right wires and you're away laughing!


Noctua Cover @ 20mm

I don't think 40x40x20 is necessary. 40x40x10 is doing perfectly. :)

Do I just solder black and red wires to old fan wires? None of the adapters it came with is necessary?

Yes! You need to solder old red wire to new red wire and old black to new black. Signal cable can be cut off short, as it's not needed (it's rpm sensor for computers).

What a fantastic upgrade this was. Unbelievable how silent the new fan is. My only regret is that this thing will make the hotend a little bit harder to dismantle due to the fact that two of the mounting screws are on the inside of the duct -- clearly the geometry requires this however.

I suggest you might want to update to your instructions to highlight the fact that the original hotend fan mounting screws are too long to hold the duct in place and people will need to use shorter ones. Otherwise they might try to force them and break something.

Again, awesome build, works really well! Thanks.

Did this upgrade today after breaking a blade on my old fan. Wow, this fan quite. I thought it wasn't even working until I actually looked at the fan spinning. The 3D printed parts fit perfectly after printing them in ABS and my printer is way quiter. Now it's time to upgrade the blower fan and add some better bearings and she'll be silent!

I'm glad you like it! :)

There's no absolutely square version of the covers...

What do you mean?

sorry, i solved my problem shortly after posting the comment. it's ok now

Comments deleted.

What Noctua fan works for the Prusa the 5v or 12v version?

12V is Prusa original fan and power supply :)

I might have a slightly different version of the extruder block ( prusa likes to do stealthy updated to their stl files) but m3 x12mm doesnt work. It needs to be m3 X 10mm

Thanks for the update, I'll mark this in description!

Does this plan include an upgrade for the radial, part-cooling fan? Or just the hotend cooling fan?

Just the hotend cooling fan. I don't find noctua to have enough CFM to efficiently replace radial fan.

Ok cool, thanks.

I have made this together with a Gelid Silent 4 fan. They are much cheaper than the Noctua fan's and they are also very, very 'silent'. You only need to mirror the fan-cover, since the wire is positioned differently. Thank you very much for this great design!

By the way; did you print the fan-cover in two colors...? (black / orange)

If somebody is interested in the Gelid fan: http://www.ebay.nl/itm/GELID-SILENT-4-dimensie-van-Fan-40-x-40-x-10-mm-12W-3PIN-M6B9-M6B9-XINO-TUNING-/192091747945?hash=item2cb98f7669:g:iS8AAOSw2xRYj4A3

The wires are not color coded, but if you Google the pin-out you can easily find out how to connect this fan (solder it to the existing cable, like described below)

That is very good man! Yes, indeed, the fan-cover is printed in 2 colors.

Hi, If you don't have both colors in same material or don't want to print in 2 colors I have split the cover part in two here http://www.thingiverse.com/thing:2248980

Noctua Cover Split for Prusa i3 MK2 or MK2S (Remix)
by luc_e

I take it this doesn't limit travel on the x axis? It looks like fan would be close to colliding with lead screw on left side.

Nope, it does not interfere with left lead screw. Printer can work normally with this :)

How did you wire the Noctua? Did you just cut the old wire and soldered it in playce of the old fan?

Hello! Yes, that's exactly how I did it. I cut noctua cable 4-5cm from the fan and on the old fan I cut cable 1cm from the fan. Than I soldered red->red and black->black wire, while cutting the yellow wire as close to fan as possible - as we don't need it ... ever :). Make sure you put some heatshrinks on the wires prior soldering :)

I'm using this with no issues. Noctua fans are so silent!! Thanks a lot for the design! :)

I'm glad that you like it! :)