You will need a blank battery contact board.
Survival Laser Driver
I would also recommend a couple dust caps (lens covers).
Silicone Lens Cap
I hope this helps you!
I wouldn't recommend that you purchase ANY laser without the proper safety eye wear for the particular wavelength in question, as NO laser is completely eye safe.
I stumbled across a video on Youtube of a gentleman with a portable 50 Watt Co2 laser breaking glass, igniting cardboard and plastic, and all without using any type of laser safety glasses or goggles! Surely the glass would throw some type of back reflection right?
Here is the video...
Re: Building a laser. Then giving it away.
Use L.A.'s Totally Awesome Drain Cleaner from the dollar tree on the threads! Cant beat it for $1. Click the link in my signature on the C6 build and it will show you how it strips the anodizing. If you are doing threads only I mix a little with...