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Joint parts for fixing the power supply unit.
Can be fixed vertically or horizontally. Can be hung from the back of the shelf.
It is safe because it has a lock and cannot be removed without lifting.
The joint is fixed with M4 screws
You can fix the mount parts anywhere you want with any screws you want.

In my environment, the Ender3 power supply unit is fixed under the shelf and the KP3S power supply unit is fixed on the side of the shelf

Vertical output is recommended because it doesn't need any support inside the joint.

https://twitter.com/PENHOLI1/status/1482324313676353541?s=20&t=1irrdVkuzpAi1wXi0v8W7A

Creality

Yes

0.2