Gridfinity AAAA and 9v Battery Holder

A standard 2x1x3 Battery holder. Holds 8 AAAA Batteries and 4 9v Batteries with convenient tapers to allow the batteries to slide in easily.

An extension of #GridFinity, open sourced by Zach Freedman: https://www.youtube.com/watch?v=ra_9zU-mnl8