Part 3 (Chapters 7–12) discuss the use of 3D printing in different subject disciplines, with a particular focus on the K–12 classroom. We start off with a brief introduction to common issues in classroom 3D printing, and then look at art and theater concerns, considering print post-processing topics like gluing, sanding, and painting, as well as a bit about casting jewelry. Then we consider engineering concerns, such as making a print strong enough for a functional job. Next we take up using printers in language arts and social studies, and in the elementary school environment. Finally, we talk about how 3D prints might help special-needs students, particularly the visually impaired.