Power bank
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I made this model with the aim of having a compact power bank while optimising capacity. You can use two 18650 batteries, it's up to you to decide the capacity, personally I've used 3300 mAh batteries. I use this circuit: https://a.aliexpress.com/_EGBf6Kb You can print it in plastic or resin, I've tested both. For the charging module part, you'll need to adjust the connector locations to suit the tolerance of your printer. To fix the circuit, do not use hot glue as it will melt with the heat of the circuit. Instead, use epoxy glue or another heat-resistant glue.
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