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This instructable shows how to make a ring with a glowing LED (in case you can't afford the old fashioned dull rocks).

The led is powered by two #10 hearing aid batteries.  Design and print files for the 3D ring and LED holder are available at:
http://www.thingiverse.com/thing:119011

Step 1:

Print the ring and the ring cap.

Step 2:

Place wire wrap wire around the anode (plus end) of the LED.  Place it as close to the body as possible.  Cut off all of the lead that is not being used by the wrapped wire.  Place heat shrink tubing over the wrapped connection and heat the tubing.

Step 3:

Place the LED in the cap and cut off the cathode lead where it just extends slightly beyond the cap.

Step 4:

Strip the end of the wire wrap wire and bend it so that it runs across the bottom of the hole in the ring.  Place the wire wrap wire in the channel. Insert the batteries, positive end down in the ring.

Step 5:

Be certain that the LED is illuminated, then glue the two halves of the ring together with superglue.
im sure there are many different improvements to this altho it is a very nice design and i had had the same idea, i plan on using the LR621 batteries and sanding the LED as much as possible making the hiding places for such lightups much more abundant aswell as adding a switch made from the led leads themselfs, gotta wait for my printrbot to arrive before i can prototype anything tho ^w=
Sounds very good--can't wait to see how much you can flatten it out and hide the electronics. I'm sure you will enjoy your printrbot!
Funfunfunfun! Smart and simple. Did you consider adding a switch?
I tried to add two 2-56 machine screws to hold the pieces together--but it was an afterthought and the shoulder of the ring needed to be a bit wider. That would have allowed for 1) replacing the batteries and 2) turning it off and on by making the screws tight or loose. I'm sure a tiny switch could be squeezed in, but I would probably have superglued my fingers to the ring if I had to hold any more pieces together :)

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Bio: I am an author and a maker. Current projects include Santa's Shop and Little Friend (ultracapacitor powered robot) on hackaday.io. I'm working ... More »
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