Corral your 18650 batteries:
- Tough one-piece prints
- Print without supports
- Secure and easy-to-use clips
- Recessed/covered battery contacts
- Charge indicator.
The batteries are meant to be a snug fit, but if they are too tight then scale the print up a percent or two.
See https://www.thingiverse.com/thing:7140070 for AA battery packs.
See https://www.thingiverse.com/thing:7186635 for AAA battery packs.
And https://www.thingiverse.com/thing:7198077 for CR123A ones.
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