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by darkwave3D Apr 30, 2019
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It works good, thanks

Printed the 40mm for my hot end fan (Ender 3 pro). Of course the stock cover does not give the opportunity to fix it to the fan bolts. However, some tape to hold on to the cover worked well and there was the fan whine — gone! Just need to fix the PSU fan noise now.

A great mod!

This is my PSU mod on my Ender 3 Pro. The PSU fan is a 12V (like the original)....
This is a 1 week old photo... now I drilled some holes under the fan.

That looks interesting. You seem to have a new plastic cover to the upper (steel) part of the PSU. Is that a thingiverse print? What type of fan did you add (it looks like a 80 x 80 x 10)?

It is a 90 x 90 x 25......
My cover is not a print but ... ehmm ... I sawn it from a receiver housing (it was 2 o'clock in the morning and it had to go fast - you could call it a prototype ;) ). The original fans are so loud just because of the cutouts - PSU fan, hotend and motherboard. The motherboard fan is a 24V and I did not have any to swap - here it helped to increase the distance to cutouts -> loosen screws and stuff foam between the fan and the case - that's enough to make it quieter.
My PSU fan is now much quieter, is rarely on and then runs synonymous shorter.

P.S. In the picture - my fan vs original

I'll probably print that:
Ender 3 PRO PSU Cover:
and test with 80 fan - have some lying here and will take the quietest.

Ender 3 Pro PSU Cover for 80mm

This works pretty well for something that wasn't tested

could this work with a radial fan?

  • Posted with 3D Geeks Thingiverse Browser App

Some pics about used principles to public (see inner profile line - here are many horns) and for you idea to make black hole chambers to better conversion from sound to heat. Profile like daisy flower. Did not have idea how to combine it in math.

Thanks for this design, it reduces the noise in the high frequency range.
Because I want one for my 50mm fan, would it work if I just resize it in the slicer?

Keep in mind that resizing it in the slicer is just scaling. Which means the mounting holes will be scaled as well and might be too large.

Any chance of getting one for a 120mm case fan?

I tested and I find them less effective in my personal setup than your other design. So I'll stick with the taller ones.

Effectivitty depends on the noise spectrum and used filter. But nobody measure freq characteristics, because is simpler to print and test it.

Try to add some blades to eliminate high speed rotational flow streams. It could lower hiss noise. Something like here

but it have bad shapes.

There are better blades, but no shell

Silencer for 40x40mm fan (e.g.Noctua)
by flo4nau
Axial Fan Statorinator
by Madau3D

Thanks...for the miracle :-)
I have a similar change in mind for some time...

Did you know something about acoustics and wave theory?

  • Bwwhat? Not...

So it is Miracle...

It is not simple to compute these shapes, numerical analysis and Monte-Carlo math applied. Time consuming...

It works as stop-band acoustics filter, where some frequencies are damped. The original desigh work very well after resizing to 60mm fan too. Used at 60mm on exhaust side resized to 115% works nice too. Not used on bigger fans at the moment.

The first is higher frequency dampener with phase reversal dampening (some like bass reflex ports on the speakers). Second is lower freq dampener and third is something between with wide band.

I did not know, why author does not paste some chars about theory. But it is really not simple to explain that to simple programmers.

"But it is really not simple to explain that to simple programmers"

Correct me if I'm wrong, but you seemed to do a decent job at explaining how it works, so when done in a clear way explaining isn't that hard. I don't quite understand how being a programmer comes into the picture, would you mind elaborating?

Sorry, it is about journalists, programmers, lawyers, managers and politics. All they THINK that they understand to something, but not. And here are programmers.

Creators point of view is not simple to explain - try to explain this in few simple words: https://www.math.fsu.edu/~hju/index_cht16.html

I wouldn't specifically say people who make 3d models/3d prints are all programmers, but I get where you could put them all in a general "techie" category. I agree though, everyone thinks they know the right answer, but really they only see their side of things.

And ah, I thought you were saying the concept of silencing the fans was not simple to explain, not specifically the creator's point of view haha. That was a misunderstanding on my part

What's the theory here?

Okay, soooooooooo how does this serve that purpose and how does it work?

It works certainlyin the case described in the other object, and best with noctua fans


Because it creates an air flow between the metal of the case and the fan...

Originally it was designed for the alfawise u10 control box fan,
then every person does what he wants ...
it can work as a fan protector.

try and let me know..

got some cheap fans by accident ... cheap and noisy ...
so i printed the 40mm version silencer, mounted it and took another fan to compare both:

first thing i noticed was a clear reduction of noise that came from the silencer! (feels like one third/ half of the noise)
secound thought... : does this also reduce the airflow? -> took a lighter and watched the flame moving .....

  • the bare fan flame was widespread and barely moving through/towards the fan
  • the silencer fan flame surprisingly formed a compact fast moving fire vortex
    which was pulled into the silencer and towards the fan like crazy....

might sound a bit crazy and !DON'T TRY THIS AT HOME! for sure ...but ....
I love this design thank you ;) works for me !