4X and 2X dividers for Akro-Mils 30210 (30-210) bins. Here are the upper bins shown in the photos: https://www.printables.com/model/966907-upper-compartment-for-akro-mils-30210
Note that the dividers have a bit of a wedge shape on the front and back edges to lock into the bins, so don't be tempted to print the 2X divider on its side.
The author marked this model as their own original creation.