From prosthetic limbs to giant concrete play castles, 3D printers have opened the doors to a new means of design and production. In 2013, Hennepin County Library began to explore different ways of using this technology as a learning tool for patrons. We will discuss the basics of 3D printing, the programs and collaborations we have explored, and the successes and road bumps we have encountered along the way. We will also demo the 3D printer and the 3D design and build software so you can see the process from start to finish.