DIY 18650 Lithium Ion Cell Battery Charger

I bought some 18650 Batteries and needed a way to charge them, so I decided to build a couple of my own chargers!
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Contents
0:00 - Intro
0:30 - Off the shelf instructions
0:55 - Build 1
1:34 - Testing Build 1
2:22 - 3D Printed case & instructions
3:02 - Build 2
4:40 - Testing Build 2
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Links
3D Model for Battery/IC holder: www.thingiverse.com/thing:284...
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Necessary items for this project:
18650 Battery
18650 Battery holder (buy or print)
TP4056 Charging Circuit
Wire + Soldering Tools
USB-C cable
Glue gun (optional)