kossel PSU cover

I redesigned this cover because it didn't fit my 12V / 30A power supply. The 113x50 size was fine, the module with the switch sat, but the position of the holes precluded the use of the original cover. I have side holes with threads 32mm from the edge and have a pitch of 25mm. At the same time, I left a cutout for brackets mounted from the back of the power supply.