Recovered over a 100x 18650 batteries from old electric bikes battery packs and laptop battery packs.
Needed a way to store them for later use when starting to build a power wall.

Also placed the stl for an 18650 (in case you want to use it for visualization in a project yourself).

Size is 200 x 200, so fits for the most printers.

Always better to be safe then sorry, be careful with those high powered batteries.
When used wrong, they can explode or catch fire.
Be sure to know your Ohms law when you use those batteries.