This document provides an introduction to 3D printing, including the different types of 3D printing techniques, resources for 3D models and software, and the parts and process of 3D printing. It discusses the history of 3D printing and how it was invented in 1984. It also explains the key parts of a 3D printer, such as the extruder, print bed, and cooling fan. Finally, it outlines some popular 3D printing techniques like SLA, SLS, and FDM and provides resources for 3D models and software for 3D modeling.