3D printing is permeating every industry from architecture to filmmaking. Here are some of the latest commercial uses, including rapid prototyping, customized objects, mass production, reconstruction... and some pretty weird use cases. We discuss how the technology works and how you can 3D print something, and the important steps involved in a 3D printing workflow. Plus, learn about a real example of how Oslo converted terrain and building models and printed a scale model of the city.