Altoid tins 21700 battery holder
thingiverse
Remix of the 21700 since the lid wouldn't close with batteries. https://www.thingiverse.com/thing:3499872 The gap in the bottom can be printed as is or filled like picture 2 shows, using a brim. The lid will warp slightly due to tight tolerances. PS: Don't forget to keep your battery sleeves spotless, especially with metal housing - a careless mistake could leave you burned.
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