Dual Battery Power Box (AAA for now)

thingiverse

This is a straightforward power box for batteries. Currently designed for AAA, it may also accommodate AA and 18650 in the future. The structure uses minimal plastic with walls that are 0.8mm thick, consisting of two layers. It's printed at a layer height of 0.2mm and 20% infill density. You can increase the layer height if you prefer. To assemble the power box, strip two wires and create a small loop, then insert them into the holes. Snap your batteries in place. Depending on your battery tolerances, the top should align flush. Wrap the wedge with aluminum foil and press it into position from the end. Disassembling the power box involves using a screwdriver to push out the wedge from beneath. Then, carefully pry out the batteries one by one. You can create your own customized wedge to match the specifications of your battery and wires. My primary use case is series configuration, but you can easily adapt this design for parallel connections as well. If the holes printed too small, simply drill them out to the desired size. If your battery isn't fitting flush, try adjusting the top and bottom to a slightly higher position.