Water Activated Flashlight Tube
thingiverse
Making an Easy Water-Activated Flashlight Using a Super Effective NS Coil Tube Printed from 3D. Instructions Print your tube using the print with support option. Visit http://youtu.be/GSdu1vsSt0M to view a video explaining this flashlight design better. Go to http://laserhacker.com/?p=443 for additional information about how to build it.
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