Modular FIFO AA battery holder
thingiverse
This design allows you to utilize freshly charged batteries in a First In, First Out (FIFO) manner. The modular nature enables endless expansion by printing multiple middle sections. Assemble the components using an M4 threaded rod and hex nuts on the bottom parts. Check out this link for more details: https://www.youmagine.com/designs/modular-fifo-aa-battery-holder. For a glimpse into the design process, watch this screencast: http://fns.csokolade.hu/2014/04/17/3d-nyomtatas-tervezzunk-fifo-elemtartot-aa-meretu-akksiknak/.
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