My 30A power supply unit doesn't have holes in the right place to screw in graber structure, only 2 on the bottom. I didn't want drill it, so I decided to design my own holder top to give some tight fit without gap and prevent to cause some crack on the graber wall.
Graber Wall Thickness: 6.5mm
PSU Height: 50mm
Rotate X +90% to better printing
Shell thickness 1.2mm
You can stick a piece of double sided adhesive tape between the holder and the psu