Ender3 V2 silent 120mm fan for power supply and motherboard

in the pursuit of silence on my ender 3 V2

Stock was 62-65dBa, now it's 50-54 dBa with this and my 4020 hot end fan (see my other parts for this mod). Note, it's about 1dB louder with the 120mm velocity stack than with nothing on the fan. I also included a model for a slimmer, more regular fan grill but i did not test this one.

I used an Arctic P12 fan and it's plugged in the psu fan connector. But it flows too much air to the psu, fan often stops mid print. I guess the motherboard shoud have airflow non stop so i plugged it into a buck converter to the 24v output so the fan is always on. Fan and fan grill/velocity stack are bolted with regular PC fan screws.

For the PSU part i cut both the PSU cover and the black cover creality put over it. Furthermore, i used a 1.5" hole saw in that black cover to free the vent holes. Creality seem to have missed this one, they put a pannel over the vent holes from the factory PSU cover...

Duct is printed in 2 parts and used jbweld to put it back together. And just used duct tape to secure it to the manifold. I made the lips at the end of the duct to use double sided tape or screw it in the printer but it's pretty snug under there so it just rests in place under the printer. i even had to put 2mm shims under the printer to clear the duct. The Manifold is bolted at the bottom with the two original screws holding the PSU mount and at the top you can add 2 T-nuts to fix it in the channel.

I also include STL's with 1mm thin ducts instead of 2mm. faster to print and no need for 2mm boosters under the printer feets.

P.S. i also used 2 t-nuts in the top chanel to bolt down the fan support part.

The big manifold needs support to print the bell shaped part, otherwise the duct part prints well without support. Both ducts and the velocity stack prints well without support too. About 17h of print time with a 0.8mm nozzle.