These brackets are designed to securely hold a rectangular item to the honeycomb wall panel. I used it to hold a Raspberry Pi and a network switch.

Each set of top and bottom corner brackets also needs a “insert-with-M3.stl” from the main "honeycomb storage wall" page.

In addition to the plastic parts you will need an M3 nut and 10-12mm screw to secure each bracket to the honeycomb insert, and two M3 screws per corner bracket with approximately the same length as the height of the object to be secured.