A Raspberry Pi bottom cover based on the “armor heatsink” you can find on like aliexpress etc.
It's not a 1:1 copy, specifically I made the thickness of the plate where you put screws in pretty thin so that the screw can go through and it can grab the standoffs I'm using. It still is pretty solid regardless.
I printed it with support enabled, “Normal (auto)” and 5 threshold angle.
I also made this model so I can easily wall mount it with help of this model: https://www.printables.com/model/1102910-wall-mount-for-raspberry-pi-armor-case-more-screw
The author marked this model as their own original creation.