I really like the form factor of the Multiboard Multigrid system, and am working on switching from a small gridfinity system. This is my first shot a building a custom tool holder in Fusion360. I started with a 1x1 bin, and cut the base in Bambu Studio, and loaded the mesh in Fusion, and built the holder part from there.

Credit for the original gridfinity holder goes to atrimbletlr at thangs.com. Inspiration model here: https://thangs.com/designer/atrimbletlr/3d-model/Gridfinity%20Ruler%20Holder-74621

Print two of these to allow for storing six rulers of varying lengths.

No support required. I printed in PETG, but other materials should print fine.