Ender 3 S1 Pro Bottom Plate

I still had two fans in the sizes 135mm and 120mm (actually there were three fans, one Noctua had to bravely give up its life). Since there are two fans with 12V, I connected a voltage converter from 24V to 12V in between. I mounted the voltage converter very close to the mainboard where it is well cooled by the 135mm fan. My goal was to make everything significantly quieter while maintaining the same cooling and to my great surprise it was far better than I had hoped. I wasn't aiming to publish it but just have a bit of fun with my new hobby of 3D printing.
That's why I didn't document it with photos. But since it turned out pretty good (my amateur opinion :-)) I thought I would make it available to others.

From a technical point of view, it's not that exciting. As I said, one 135mm and one 120mm
fan have been installed. I designed the size of the holes in such a way that the fans fit exactly
and cool the important components. You can put the plates together like a puzzle and fix them in the middle with a strip. There are more holes than you need. Right from the start, I intended to blow the warm air outside and had already thought about how I could do this without cutting through any walls. During the first test, I measured the temperature inside (air temperature in the middle) for a long time and it was actually exactly 10° C cooler.

And it was just as pleasing to find that the stagnant air comes out of the front opening (the small compartment that nobody needs). I then quickly created a grille to make it look good. Incidentally, I removed the cover from the power supply unit and left it as it is.  But it should be enough if you leave the lid on. If you also want to remove the cover, you should take safety seriously when working on a power supply unit. The two fans are completely oversized. But as they say: better to have than to need.

I would like to point out that I am a layman. Everything you do with the parts provided is at your own risk. If you want to criticize I would be happy if you comment here.

Have fun printing:-)