Adaption of https://www.printables.com/model/346977-sovol-sv06-psu-mount-bracket
The original front bracket had considerable overhangs that required supports. I wanted to print in PETG without supports, so I redesigned it.
It should be obvious what side needs to be down on the base plate. Tolerances are tight so make sure you allow for any shrinkage.
You also need to print the rear bracket from the original.
The author remixed this model.