Power Supply (PSU) Bracket Customizations

This project started off with my work on rebuilding my MaxNC-15 CNC Milling Machine. I gutted the old electronics and am installing a Protoneer RPi-CNC and Raspberry Pi to drive it, along with new stepper motors and a bigger power supply. These, I'm mounting to a 1x8 piece of plywood that I am going to bolt to the back of the CNC machine in place of where the original electronics box was located. I needed a way to mount the 36V power supply to the plywood and that began my work with these brackets.

I found [this original power supply bracket](https://www.thingiverse.com/thing:1091724), but it was about 1mm too narrow to fit my power supply without bowing the clips significantly. Also, I thought to make use of the M4 screw holes on the bottom of the power supply to bolt it to the bracket instead of relying on the friction and springiness of the clips to hold it in place.

So, I wanted to remix it a bit and add 1mm extra distance on the inside and add screw holes that I could bo