SMALL UPDATE:
I tested some solutions, but I’m still waiting for a lot parts (I mostly order directly in China because of the HUGE price gaps for the exact same product).
The first 25x25mm fan arrived, thats the part cooling fan. I use this one (https://de.aliexpress.com/item/32961658252.html?spm=a2g0s.9042311.0.0.27424c4d4Q7DjL). I really recommend to switch this one, it’s just a little quieter, but has a slightly improved airflow which is nice.
For the PSU fans:
I’m still waiting for some parts on my side, but I found a lot of interesting workarrounds with 12V fans.
Contrary to my prior posts a 40x40x20 fan DOES NOT fit in the PSU by ca. 1mm without tinkering. You should use a 40x40x10 fan if you want an easy solution.
Right now I run the PSU without a back fan and without all the extra LED stuff inside. For 3D print thats totally sufficient but I’m not sure if the cooling is ok for every application.
For the enclosure:
DO NOT use acoustic foam when you don’t have an extra part cooling fan (like this one 3DP Part Cooling Fan 5015 Replacement for Gen 1 extruder - #167 by hoaschter).
The enclosure will get to hot inside and it’s not possible to print steep overhangs or bridges (I made a picture of a temperatur test without extra cooling).
I also recommend this clamps for the doors, so you don’t have to cut the foam extremly precise or otherwise the doors don’t close completly.
Snapmaker 2.0 enclosure door clamps by BrienAllison - Thingiverse
Also double sided tape doesn’t seem to be the best solution for the acoustic foam on the doors, the foam will eventually fall off, I’m searching for a better solution (maybe something 3D printed, I got a couple of ideas).
About vibration:
I HIGHLY RECOMMEND a proper anti-vibration solution. In my case I use a 2cm thick 80x60cm granulated rubber sheet. It reduces the noise in the room but especially the quiet vibration sounds that you hear at night. You can use a solution with foam, but my A350 with enclosure is to big for concrete+foam and to heavy for just foam.
There is a brilliant video from CNC kitchen about this topic.
I will test some exhaust solutions in the future and make an overview next month.