In this chapter, early childhood students design a piece of playground equipment using a 3-D printer. Kindergarten and first-grade students were charged with designing new playground equipment to create a solution to a problem of the school playground needing more equipment. This project engaged students in science and engineering practices as described in the Next Generation Science Standards. The playground project demonstrated that this age group benefited from being part of the process, and that this foundation of critical thinking and problem solving can be built in the early grades to enable advanced processing and knowledge base in the later grades. A materials list, teacher background information, and outcomes are provided. This book selection includes the Table of Contents, Introduction, References, Internet Resources, and Index.