I needed a Windows PC for learning Fusion 360, so I designed this one using Thinkercad.
The case holds one mini ITX main board and two 2.5" hdds, as power supply I used a pico PSU: https://www.amazon.de/gp/product/B004QDP05C/ref=oh_aui_detailpage_o03_s01?ie=UTF8&psc=1
The hole for the pico PSU needs to be drilled, this has two reasons, I do not belive the diameter of the pico PSU's plug is standardized and some mini ITX main boards have a sort of pico PSU already included and in this case no additional hole is needed.
I printed the top cap with lesser retraction as normal, the first try with my normal retraction settings caused a clogged nozzle.
The cylinder has been printer with a slightly greater layer height to speed up printing, all other parts has been printed with .2 mm layer height.
Only the main board tray needs support material when printing.
The cylinder is available as a splitted version which I used, hence I glued the parts tgether, using "UHU Plast Sepcial Modellbau" glue.