Ridgid doesn't give you these dividers with their Packout-style drawer unit so here they are! The locking tabs only protrude in one direction so these are easy to print and they fit snugly.
Print them flat with the tabs upward as shown in the picture. I printed mine with the top and bottom layers set at 4 with 20 percent infill and they're nice and strong.
Ridgid_Box_Divider_2.stl | 191.4KB |