Update: for a newer version with better internal wiring using only a 1.6mm /14awg wire, see https://www.thingiverse.com/thing:2647700
I had a spare 26.5mm "drop-in" LED bulb, so i made a handle for it. You could easily buy this for $12 CAD or about $9 USD but why buy when you can make out of scraps? It's SUPER BRIGHT - about 1000lm, about as bright as a 100W incandescent bulb, but unfortunately runs quite hot after 5 minutes (hence the semi-open air cooling design).
1 protected 18650 cell
1 LED flashlight "drop-in", 26.5mm version - these used to be $3 each but have since gotten more expensive. You can buy them now from aliexpress, the ultrafire.com site, dealsextreme, etc etc. You want the ones with a reflector and a driver board already built in.
1 clear plastic circle 26.5mm - you can cut this out of anything, i used a dremel on a demo lens (ask for these at your local optometrist or optical store, they just throw them out)
1 SPST latching switch from junk giveaway flashlights (seen in photo above)
2pc copper (or other metal) strips at least 70mm long
Pretty straightforward, but the back cap is a bit tricky because you have to ensure you have good electrical contact.
3D printing and wristwatch enthusiast, and designer of random things
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