In the past five years, there has been tremendous growth in the production and use of desktop 3D printers. This growth has been driven by the increasing availability of inexpensive computing and electronics technologies. The ability to rapidly share ideas and intelligence over the Internet has also played a key role in the growth. Growth is also spread widely because Internet communities allow people to share designs that can be manufactured and reengineered without leaving their desks. Educational institutions at all levels are beginning to recognize the value of 3D printing technology and have begun to incorporate these machines into their laboratories. A 3D printer facilitates the interactive instruction in technical concepts and systems consistent with the nation's focus on science, technology, engineering, and mathematics (STEM) learning initiatives. The purpose of this article is to share introductory information about 3D printing, how 3D printing can be used in the technology and engineering classroom--especially how this teaching and learning artifact directly relates to learning standards--and to share examples of hands-on artifacts that can be designed and prototyped in the classroom.