Ender 3v2 - Silent Mod

After a lot of research, I also completed my Silent Mod after about 1 month and I am very satisfied with it. Everything runs as I expected.

What was done:

Printer raised with extra feet (https://www.thingiverse.com/thing:5349469)
PSU fan was exchanged for a Noctua NF-R8 1200 with 9.1dB(a) (almost inaudible). Of course, a new housing was printed in PETG (https://www.thingiverse.com/thing:4704104)
The fan for the mainboard was also exchanged for a Noctua NF-R8 1200 in a suitable housing (https://www.thingiverse.com/thing:5072597)
Printed a new fan duct (Brissmoto Fan Duct)
One Noctua A4x20 FLX for the hot end
One Noctua A4x20 PWM for the part cooling, with the PWM signal managed by a little Arduino nano
Finally, I designed and attached some housings for the fans (see picture)

vid from the noise level:

vid with a needle test:

In both vids all fans are on full speed. And as you see it was a progress, the vids don't show the final picture :-)

Cabling:

So far, the printouts have all been great, sometimes even better than before. So far I can only say that the fans are completely sufficient.

Here a picture from below the printer:

As many people asked how I did it with the wiring of the arduino, I try to explain it.

First a picture:

The little black box left of the mainboard contains the arduino nano with just the pins accessible.It is powered from the buck converter with 12V.From there (sorry I had no other colors available :-P) the yellow cable goes to the negative port of the fan on the mainboard. From here the Arduino gets the information which voltage is being requested. Over the white cable (moving to the blue/white cable from a old CAT5 network cable) the PWM signal is being sent to the fan. Here also a short video:

The PWM wire is connected to port D9 of the Arduino and the negative wire is connected to port D4.

The result looks like this:

I don't test all speeds inbetween, but it works, no matter which speed I set.

Maybe this helps other people with their project :-)

Oh, and I added some colour to my printer with a light green.