The laser in question is a 500 mW unit, driven by the Z axis on the Arduino CNC shield used to run the system.

An interesting Arduino project has been published to the Instructables website showing how an Arduino CNC shield and controller has been used to create an awesome 3 axis Arduino CNC plotter.

“The pen plotter in question is a DIY machine that Oaks constructed using linear rails, stepper motors, and an Arduino Uno board with a CNC Shield that runs Grbl firmware. The computer connected ...

UPDATE: The FR4 Machine Shield is now on Kickstarter We know the concept from quadcopters, little robots, and generally things that are small enough to make use of their PCBs as a structural ...