2 Cell in-series holder for SR57 button batteries
thingiverse
This is a minimalist battery holder designed to fit two SR57 button batteries in series as a very compact 3-volt supply. The batteries slip easily into place inside, where they are securely held by bare ends of AWG 30 wire inserted snugly into holes on either side. A slot at the back makes it easy to push out the batteries when needed. Update: Fine-tuned dimensions and oriented for optimal print position as of September 9, 2018.
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