3xCRGR 18650 power bank

That's the 3x battery version of my original CRGR (https://www.thingiverse.com/thing:2765404)

Everything is the same but it designed for use with 3 18650 batteries

Model is perfect fit for this USB boost converter and even for a bit longer batteries.

Use a spring terminal in the deep end, wire should go in a long groove on the side

Excessive wire can be stuck under a PCB, just make sure that micro USB is fit in it's slot first.

Board I use is "DC-DC Step Up Power Module Boost Conv