Helmet Power bank holder
Description
This is holder for cheap power bank using 2x18650 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=CN). made of PLA, 50% fill rate
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