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What Is 3D Printing?
3D printing is conceptually straightforward. An object is created by starting with nothing and adding material a layer at a time until you have a completed object. There are many natural examples of the process, and lower-tech variations have been used by other names for millennia—for example, making a brick wall.
The current 3D printing boom is really just an evolution and convergence of technologies and techniques that have been around for a while. However, there are some crucial technical and business-environment innovations covered in this chapter that came together to make consumer 3D printing affordable. To give a clear mental picture of how 3D printing works, we start with natural processes that look a lot like it.