Simple divider for the AAA battery storage box by cognetic: https://www.thingiverse.com/thing:2876022

3 models included depending on how much friction is required with the battery box. 'Tight' is the same dimensions as the original. 'Normal' has 0.1mm and 'Loose' has 0.2mm larger air gaps.

I'll make a similar divider for the AA and 18650 box.

No

No

Brim is recommended