18650 to 20700 Lithium Cell Charge Adapter
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Convertor to charge the 20700 larger batteries in an 18650 charge unit
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Printed in two parts to avoid supports and have better adhesion. 20700 section can be used as a standalone for other projects. Battery clips are Keystone #209. I bought mine a few years ago from EBay but I found them on Amazon. The prethreaded holes in the bottom section are 5mm. Ends support up to 12mm depth and top support up to 10mm. 10-24 or 10-32 SAE screws can be force threaded into these holes. They are about the same size. I first used round headed screws into the ends, but it worked better with flat head with my particular charger. When using pay attention to polarity.
I used a generic PLA with 20% infill, 0.8 wall and sides, 0.2 layers Designed with Tinkercad, printed on Ender 3 with PEI build plate.