Ender 2 power supply case

Inspired by [this](https://www.thingiverse.com/thing:2675440) PSU cover. The cover was to small for my PSU, so i made my own design. I made it a little larger with cutouts for an XT30 connector and [this](https://www.voelkner.de/products/36405/Kaltgeraete-Steckverbinder-Stecker-Einbau-vertikal-Gesamtpolzahl-2-PE-10A-Schwarz-1St..html) power connector. I also added mounts for M3 screws.