Helmet Power bank holder
thingiverse
This is a holder for a cheap power bank using two 18650 cells (https://www.banggood.com/Bakeey-2x18650-2.5A-One-USB-Port-LED-Display-5600mAh-Battery-Case-Power-Bank-Box-for-Honor-8X-p-1379764.html?rmmds=search&ID=224&cur_warehouse=US). Made of PLA, with a 50% fill rate.
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