Instead of throwing away your pencil stubs, you could always feed them to this concept printer, which will then convert the pencil into “ink” for your document printing needs. It supposedly works by separatin g the wood and lead inside the printer, which can then be used to print your document. The cool part is that it can even erase the “print” on your documents, thanks to an eraser that you can pop into the printer too. Considering the rising cost of printer ink nowadays, it wouldn't be too bad if they turned this concept printer into a reality.