Discover how today's innovators are finding ways to make 3D printers smaller, easier to use, and more affordable than ever. Calling All Innovators series introduces students to careers in science and technology. The complex text allows readers (Grades 5-8) to determine the main idea and explain how it is supported by key details. The idea of downloading and printing out a three-dimensional physical object using a personal computer might seem like something out of a science fiction story. However, the latest 3D printing technology is making this incredible dream into a reality. Readers will learn how 3D printing is changing the way we manufacture aircraft, treat injuries, and more.