At the time I am posting these, Multiboard only has brackets up to 2x2. I wanted something larger so I came up with these.
They attach using the large Multiboard bolts. Use the 9mm Flat Head if you are putting the Multigrid Base Plate on the shelf. You want to have the base plate straddle where the tiles join. In the picture, I used 4 8x8 tiles. So I used 3 4x4 base plates and 2 4x2 base plates.
I attach the base plates to the tiles with the Thin Head Multigrid T-Bolt. They take very little filament so I attached at all points. 16 per 4x4 plate.
https://www.multiboard.io/parts-library
Not intended for heavy loads. I didn't test, though I noticed the Tiles on the wall flexed before the brackets did. You can use as many brackets as needed.
March 03, 2024: Added .step files for all the brackets.
The author marked this model as their own original creation.