Inspired by great video from the guy with Swiss accent I've bought Lenovo ThinkCenter in USFF case to be my home server. I've already have my “internet devices” mounted on a wall in my closed so I quickly designed this holder to mount the server on a wall. 

Models print without supports (if you you lay them on their sides). As this is functional part I printed it with 0.3mm layer height. All the walls are perimeters-only, almost no infill. It printed in 5h. 

Hanged on a wall with 4.5 x 40mm screws and expansion plugs (Fisher SX 6 S).