The walls are probably much thicker than they need to be, but the power supply is big and a little heavy and I didn’t want this holder to ever break. You’ll want to print it with the mounting holes on the printer bed and use supports. I forgot to add a hole so I could see the power supply LED, so I drilled one. But a hole has been added to the STL file.
I modified the F360 file to make a similar power supply holder for my laptop’s power supply.
Please leave a comment if you find any problems.