Re-usable 9v battery

- use 2032 cells to provide 9v instead of paying $5+ for 9v batteries.  2032s are available for pennies in bulk quantities on-line.  3D print the parts insert the snap top from an old battery and hold together with a couple of tiny screws (#1 self tapping.)

9 volt battery from 2032 batteries MIDDLE v3.stl

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Re-usable 9v battery