Pencil Printer
Hoyoung Lee's concept Pencil Printer uses lead from pencil stubs to print your documents. Any pencil can be used with the pencil printer. Even better, the design features an eraser mechanism, and you would be able to erase sentences quickly and efficiently. No more cartridges!
http://www.yankodesign.com/2010/02/04/printing-with-a-pencil-stub/
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