3D printing is an advanced form of printing that builds three-dimensional objects from a digital file. The document outlines the history of printing from wooden block printing to modern techniques like laser printing. It then discusses the evolution of 3D printing from its early concepts in the 1970s to recent advancements. The document explains the 3D printing process and common methods like selective laser sintering and stereolithography. It discusses applications of 3D printing in industries like automotive, medical, and food as well as the role of 3D printing in Industry 4.0. The document also covers the size, cost and impacts of 3D printers as well as advantages, disadvantages, and future scope.