Organize the organizers! Here is a simple bracket that makes it possible to build modular shelving racks out of 15mm T-Slot aluminum extrusion.  It works with Misumi 1515, OpenBeam and compatible profiles.

I had some extra Misumi 1515 and some Stanley bin organizers I wanted to stack neatly, Adam Savage style :). What this bracket set does is mounts the extrusion at an offset such that it works as a smooth slide for organizers/containers.  

To assemble: you will need 2x M3 8mm screws and hex nuts per bracket (4 sets per shelf, or 2 sets + regular brackets in the back). 

Hint: print with high density and supports enabled to get strong parts that fit properly.