Pi 3b+ case

thingiverse

This is minimal box for a pi 3b+ I use for a specific purpose - pi-hole ad blocker. It only needs power and Cat5 so all other ports are concealed. To keep it cool I have a grill heatsink and integrated fan. I used one of these. https://www.amazon.com.au/GeeekPi-Raspberry-Cooling-Aluminum-Heatsink/dp/B07PCMTZHF So to facilitate this I have a reasonable amount of headroom under the grill top. The two parts just push fit together needing no screws.