Summary

Also available for purchase: http://etsy.me/1p8GUIp

After a fourth rewrite, the Flashlight Ring is finally ready!
Make sure to check the remix section for all the varations I've made so far.
Message me if you are interested in purchasing a vitamins kit.

Instructions

Tools required:

Needle nose pliers
Sharpie marker
Vitamin BOM
Features a 1 watt ultra bright LED (don't stare directly at it, it WILL give you a headache).
https://www.amazon.com/microtivity-IL706-1-watt-Ultra-bright-White/dp/B0085MOSV2/
Powered by 2 watch batteries (377 series, the same I'll be using in upcoming watch project).
https://www.amazon.com/Energizer-377-376-Watch-Batteries/dp/B01AVJBH8I/
2x 1" of fine gauge copper wire (24 gauge I used)
Printed BOM
Print a ring in your proper size. I uploaded 4 or 5 sizes, and it depends on what finger you want to wear it on. Print a few and see what fits, the sizes are in mm.
Print a cap style you like. More cap styles are listed as derivatives.
Assembly
Take your two lengths of copper wire, and bend them in half. From the inside of the ring, insert the ends into the holes such that excess wire is sticking out along the band in both directions. Pull it taught.
With the needle nose pliers, pull the wire back through the battery chamber on both sides, so a loop will be sticking up past the batteries.
Insert both batteries facing the same direction. They should snap into place, leaving a loop of wire sticking up about 1/2 cm.
With pliers, twist the loop 90 degrees, so it will look like little mickey mouse ears along the plane of the ring.
Take the microtivity LED, and bend each lead downwards 90 degrees.
WITHOUT the LED, insert the cap onto the ring, over the batteries and wires. The wire loops should fit well into the slots, if you look through the hole where the LED will go. When you twist the ring back and forth from on and off, the wire loops should bend along with the cap, but always stay inside their respective grooves. If this is not the case, remove the cap, reform the loops with your pliers, and try again.
Once the loops seem to be in the right place, remove the cap.
Test the LED against the battery loops. This will ensure your batteries are installed correctly, and will let you know the polarity of the LED. Mark the positive lead with the sharpie.
Insert the LED into the cap with your fingers. Wiggle it into place until it slides in flush with the inside of the cap.
Align the polarity of the LED with the proper loop, and insert the cap, wiggling as you go until it snaps into the right place.
Slowly twist the ring on and off a few times.
Hopefully then it should work properly! When you're testing, try not to stare into the light too much, it will give you a headache..
Message if you have any problems!