Travel AAA Battery Holder - Flexible

See it in action here. To use, pinch at the middle or slightly above to release a battery. After the first one is removed, you can repeat or even poke the batteries out from the other side.

For now, it is only sized for AAAs. The real challenge was to this this printable.

Filament - 95a TPU, it would probably work better with softer TPU, but I use harder stuff because it is cheaper. Let me know if you print it softer.

Printing - This has lots of travels with no way to hide your shame by staying inside perimeters. Make sure your TPU profile is up to par. I use retractions, but try whatever. I suggest getting your extrusion multiplier perfect, your filament path needs to have no room for tangling, and unless you know better I suggest having all print speeds be roughly the same, even infill.