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Nikolaus Gradwohl found himself in constant need of battery packs to power his gadgets, so rather than keep purchasing them, he wrote up a parameterizable battery compartment generator. Of course, to make good use of this, you’ll need to have some sort of 3d printer on hand, but i like the idea of being able to design a custom battery enclosure, that can then be customized to fit the exact shape that my project requires.