Designed this Raspberry Pi 3b case to protect the circuitry. Printed this and use it every day to run my Ender 3 Pro. The case has saved the Pi a few times from stuff falling on it. I used some small countersunk sheet metal screws to fasten the case and lid together. There is ample space inside to allow good ventilation airflow for the board, and I've never felt it warm up when running.
I have the Raspberry logo on the Lid but didn't think and printed with a brim, so the logo is covered up on mine. I might have over-engineered the thickness of the case because it's VERY sturdy. I had my 8-year-old stand on the first printed version without it deflecting! I'm very happy with how this turned out! Let me know in the comments if anything doesn't work, or if you have update ideas.