Simple skeleton case for standard ATX psu, there are 2 different panels, if someone need 3,3V. I'm using mainly 12V, so finally there are plenty of connectors. Unfortunately I run out of connectors today, so can't really use this until rest of my connectors arrive, but all parts fit together reasonable well.
If there are no need for handle (witch prints sideways!!) simply print 4 rails.
Parts you will need:
Power switch suitable for 13X20 hole (might be 12X20)
5mm LED and suitable resistor (1K for 12V)
many banana connectors for 5mm mounting holes
plenty of screws from old printer or somewhere... M3 size screws might fit directly, coarse screws are still better.
Update as requested: third panel with square hole for usb connector 7,5x13,5
Edit 10.3 more images... and tested with auto filament spooler. Yep, works ok :)