These drawers are designed to fit the standard Hatchbox filament spools. Four drawers per spool, and clips for stacking the spools on top of each other. The pins should fit the four holes around the edge of the spool. No extra parts required.

I have added a thicker drawer that has 1.6mm thick walls, and 1.2mm thick base. It should work better if you need something stronger.

If you have any trouble printing the drawer pins 3mm screws will also work.

If the drawers are too tight or too loose you can stretch or compress them vertically.