I did end up having to use supports, despite what it says on the "Thing Details" page. Also, the front of the cover, as shown in the photo, is warped a bit. It might be worth modifying the design to add a thicker section on the lip to prevent that. Also, plan on having to make some longer cables.
But overall, the design works really well, and allowed me to rid myself of that piece of junk Prusa power supply.
Use supports, despite what it says on the "Thing Details" page. Printed in PRUSA transparent green PETG, first layer 240C, remaining layers 245C, bed temp 85C.