I wanted a simple shelf that mounted to the side of my Ender3 V2 to stick my raspberry pi 4 on. I went through several iterations trying to remix others shelves but decided to make one from scratch.
Designed in Tinkercad and sliced in Simplify 3D. I'd recommend some custom supports for the shelf inlay.

Creality

Ender 3

No

Yes

200

20