Raspberry Pi Bay - 4 slots

Good morning, folks!

UPDATE 18/09/2021: I added the .step file for those who would like to modify the design.

UPDATE 30/01/2021: Added, as requested in comments, 3 adapters for 40mm fans. I used a Noctua NF-A4x10 for the design.
*Fan_Holder_40mm_Close*: Only one vent for the fan.
*Fan_Holder_40mm_Open*: Opened chassis to benefit from the airflow produced by the fan all around it. Might be quieter the the close version, and airflow might be more homogeneous into space.
*Fan_Holder_40mm_x4*: Adapter to use 4 fans of 40mm. I am not sure if this is really better than a 90mm fan in term of noise and even flow, but just in cas ^^

I'm super happy to present you my latest design. I took advantage of this quarantine period to learn a bit more about programming, and I set up several Raspberry Pi (RPi) as small home servers for several applications (chat, home cloud, VPN, etc.). However, after a while, I ended up having several raspberry pi hanging around my router. With the heat we'v