Instructables user ramanff mounted a fiber-optic coupled 1W IR laser diode in a pen body to create this cool wood-burning tool.

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I am descended from 5,000 generations of tool-using primates. Also, I went to college and stuff. I am a long-time contributor to MAKE magazine and My work has also appeared in ReadyMade, c't – Magazin für Computertechnik, and The Wall Street Journal.

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