This is a very simple and easy to print divider that's compatible with the FESTOOL SORTAINER SYS 3-SORT/12 (https://www.festoolusa.com/accessory/491986---sys-3-sort12#Overview)
I use the sortainer for storing screws/nuts/bolts/other hardware for assembling my 3D models.
Each container can use 7 of these, so for the entire Sortainer, you need 84 of these dividers.
The author marked this model as their own original creation.