Stanley Deep Organizer Customizable Container Body
This customizer lets you build containers of multiple heights (2/3rds, 1/2, 1/3, 1/4, 1/6 1/12), and of any x & y width (y is the longer of the sortimo axes). With any number of dividers. To use this, you also need to print a base so that it will properly lock in with the system.