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There is a 3D printer at my company that is used to print 3D objects from CAD mockups. It makes it much easier to produce a prototype and evaluate design. And it doesn't take long to see ROI vs. sending the work out to be machined. It's also pretty amazing to watch an object being "printed" one layer at a time. The first time I watched a part as it was printed it was like seeing a scene from a sci-fi movie from when I was a kid come to life. It's a cool piece of technology, and depending on your business, it can be a useful tool.