Remix of Sean's great little DIY kit to learn soldering and 3D printing. Check out https://www.thingiverse.com/thing:2841747 for the original project.
This remix only adds in a key ring holder to the main body, so the flashlight can be connected to your keys/chain with a small split ring.
Use 100% infill to keep the parts nice and strong - you're going to be swinging this off your keys... you don't want it to snap!
Added the "nubbin" with Fusion360. I made it nice and chunky to help with strength, and kept all edges sharp with chamfers rather than fillets to echo Sean's design.