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Want to learn more about programming arduinos? http://arduinohq.com/category/arduino-programming-language/ - 3W 4'x4' Arduino Laser Cutter/Engraver
DIY | Easy Arduino Laser Tripwire Security System!
Build Your Own Arduino-Powered Laser Cutter [lifehacker]
It can cut through paper and cardboard, and engrave all kinds of wood. Such a fun tool to have around the workshop!
3W 4'x4' Arduino Laser Cutter/Engraver
Arduino Laser Show with Full XY Control
An Arduino-Powered Laser Engraver That You Can Build More
It has already come in handy for cutting out templates to use in other projects. Finally, I've gotten around to making an instructable on it. Hopefully it will help and/or inspire some of you!
Picture of The MicroSlice V1 | A tiny Arduino laser cutter