Based off the hexagonal slide in place shelf support brackets. Check attached image for assembly, but I will also put the steps below. The first profile is both side single color, but for convenience I will attached a second profile that is 2 plates separating the hexagon inlay from the bracket so you can play with color combinations. I would love to see what you come up with!

I kept the support minimal, so if you find the initial start of the overhang on the big triangular bracket to need supports I can update the profile to include them, but I had success without needing them.

Play with the infill and scale based on your needs for size and strength. I have it just set at 20%

1. Screw small brackets to wall

2. Slide the big triangular brackets in place over them

3. Attach the hexagonal inlays to the shelf (making note of the distance between the brackets you mounted to the wall in the previous step

4. Slide hexagonal inlays into the big triangular brackets