For the Conflict of Heroes series by Academy Games -- these dividers are used to help organize the counters in the provided counter trays. The game comes with 15 large sections and 6 smaller sections (you'll need that same number of these easy and fast to print dividers). They are thin, only .5mm in thickness for base and walls. Each section holds 5-6 counters and helps keep them organized during play.
As the counters are numbered, it's best practice to sort them 1-5, 6-10, 11-15, 16-20 and so on. Then as you remove a few, the rest of the counters don't spill over in their section.
These replace the paper versions I originally created (https://boardgamegeek.com/filepage/120403/coh-insert-dividers-ones-upon-game).
Recommend printing on edge as shown for no supports printing as well as strength of vertical fins.