Charging case designed for two 18650 Li-Ion cell battery holder and two one cell TP4056 battery charging and protection circuit, the design is simple and after assembly can be mounted using the 3 ouside holes, usb cable cut-out, contour on top follows the battery holder lines, 4 holes ( two for each battery) for 5mm LEDs which can be connected in parallel with charging circuits LEDs, both components can be glued permanently or connected with 3mm screws, charging boards cand be glued inside.I printed the cahrger case 3 times with different colors with 0.1mm layer hight.

links for example components:charging boards - https://www.aliexpress.com/item/New-1Pcs-lot-5V-1A-Micro-USB-18650-Lithium-Battery-Charging-Board-Charger-Module-Protection-Dual/32786777105.html?spm=2114.search0104.3.1.869d243f3bfr0I&ws_ab_test=searchweb0_0,searchweb201602_2_10065_10068_319_10059_10884_317_10887_10696_321_322_10084_453_10083_454_10103_10618_10304_10307_10820_10301_10821_537_536,searchweb201603_35,ppcSwitch_0&algo_expid=873286da-778e-46a5-b8f5-0a9634854417-3&algo_pvid=873286da-778e-46a5-b8f5-0a96348544172 cell holder - https://www.aliexpress.com/item/2-Slot-18650-Cell-Battery-Holder-Connector-Box-Case-Wire-Pins-Shell-Case/32997250922.html?spm=2114.search0104.3.217.666c3505mUHQub&ws_ab_test=searchweb0_0,searchweb201602_2_10065_10068_319_10059_10884_317_10887_10696_321_322_10084_453_10083_454_10103_10618_10304_10307_10820_10301_10821_537_536,searchweb201603_35,ppcSwitch_0&algo_expid=032f06cb-1f0b-4406-b15b-319ca2f11ae6-32&algo_pvid=032f06cb-1f0b-4406-b15b-319ca2f11ae6