So far, the twenty-first century has been a time of technical development, but what about earlier discoveries? Many of the technologies, not just 3D printing, were the product of previous ideas and techniques. The printing processes used in today's 3D printers were first used in the late 1800s to create landscape charts, and 3D printing as we know it started in the 1980s. As a result, in recent years, 3D printing has been revolutionized by the convergence of less expensive industry processes and open-source technologies. Technology is being used to make everything from low-cost automotive accessories to non-slip ballet shoes or even bridges that are classified as artificial materials. 3D printing has become one of the best discoveries before the 21st century.