Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4743092.
A buck-converter mounting plate that screws to the PSU of the Ender 5, and catches behind the power-switch for stability.
I designed it to mount 2 of the LM2596 modules with voltage display (see image below), but it can easily be adapted for other products, like a Raspberry Pi. Unfortunately, I measured a buck converter I had prepared but the ones I ordered (months later) seem to be slightly different in size...
Hardware requirements; some nuts and screws, nothing special. You could use a tap for and screw in m4 bolts, but for something electrical, I prefer to use a nut to make sure the screws stay fixed :)
The bolts that fix the plate to the PSU should be M4x8, no longer. The plate is 3mm thick at that point on purpose; the PSU has 5mm thread (as described in the spec sheet), so M4x8 will be safe. There MIGHT be more room inside, but I have not opened my PSU to check. Leave a comment if you know more than I do ;)