Joseph Moster, a Masters Student at NC State University working towards a degree in aerospace engineerin loves working with electronics and programming in his limited free time. On his blog, he just posted this article on how to achieve 3D Laser cutting with a 2D system.
A typical laser cutter can make a precise 2D cut. With rastering it is possible to etch the surface to add labelling. However if the power of the laser can be finely controlled it is possible to make engineered depth cuts such as trenches or angled slopes. This allows for laser cutting complex geometries such as a dovetail joint.
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Source: Unmanned Aerial Systems