Wanted to mount my PC above monitor on wall. Designed supports and holders for motherboard, SSD, and GPU. GPU support printed with 4 walls and 40% infill because I have an GTX 1080 and it is heavy. My motherboard is mATX so I don't think this supports can fit well with an ATX MB.
Also used this GPU support arm to ensure it won't fall))) : https://www.thingiverse.com/thing:1991057