Hello everybody I made this shelf for my Ikea bed with 29mm side thickness. This bed shelf has 3 parts: 2 mounts and plate. I use small screws because plate can be built with another material, for example cut plywood by laser. Plate has 5 mm thickness and 260x210 size, but you can made it bigger (or smaller).

I tested previous version of mount and it withstand 7 kg, so i hope new one is enought espesially because 2 mounts are used. (also I believe plate will break down earlier =) Also I made small version of mount, just to hide it from view.

Shelf is designed in Fusion 360, so you can fit it for yourself. https://a360.co/2Syop3N

I printed mount with 35% infill and 1,2mm wall thickness and plate with 35%, 1mm. Design has only one side mount, but you can print it mirrored.