Battery holder (AA / LR6 + AAA / LR3)

It's a battery holder. It's compact: it uses 38g of filament, but can store 13 AA batteries or even 16 if you don't mind stacking them on top.

It doesn't need any supports for printing. The connectors have small tolerances and they snap into place. You can glue the two halves together if you'd like, but it's not necessary.

Update: I have added a honeycomb pattern holder also for AAA / LR3 batteries because it was requested, but I don't really recommend it. The main problem is that AAA batteries sometimes spin inside the holder and get stuck.

If you want something more functional, I propose the models without a pattern on the side. That reduces the times batteries will get stuck and, even if it happens, it's much easier to get them unstuck.