Very simple way to fit your project on top of a atx power supply; use the rail, slices or hooks to tie and organize your wires.
Printed with PLA ; holes should fit standard ATX PSU.
There is two versions of the model, one thinner (2 mm, shown on pictures) and one thicker (5 mm) if you need a thicker and more rigid frame (which is probably suitable for screwing into depending on infill settings.
This is the second things I've ever designed, so any comments/tips is appreciate!
The author hasn't provided the model origin yet.