I wanted a way to mount my MEAN WELL NDR-240-24 PSU inside my Mercury1.1 electronics bay. It was way too tall but can fit placed on its side. I was not able to find a solution that someone else had made so I came up with this. There are two options and each option has two files, one with supports included for the screw holes and one with no supports. You can use an m3 heat set insert on the back to hold the din rail in place.

The first option uses a fairly common metal SSR DIN Rail adapter that uses M4 button head screws. The only name I was able to find is R99-12_for_GNA3, but I'm sure there are others. Anyway, you can use that to mount it.

The second option uses 3x ZeroG Mercury1.1 electronics bay din mounts for Raspbery Pi. Other adapters spaced for Raspberry Pis might work, but the offsets I used were around these adapters.
ElectronicEnclosure/STLs/DIN_Mounts/PI/Pi-M3_Heatset_X_2.stl at ElectronicsEnclosure · ZeroGDesign/ElectronicEnclosure · GitHub

Also, if you don't mind, post a make and provide some feedback. I would love to see if anything I am making is helping someone else. Thanks! Happy printing.