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Create a DIY Electric Pencil Sharpener from an Old Bottle

With school kicking back into high gear for most people, don't be stuck with a dull pencil in class. If you're an engineer, you could certainly buy yourself a portable pencil sharpener, but imagine how impressed your professor would be if you made your own. Through the use of a small motor, a 9-volt battery and a soda bottle, you can create a rather functional little tool. Check out the build process in the video above.

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