Book excerpt: LEO the Maker Prince teaches children (both young and old) about 3D printing by following Carla and LEO's journey through Brooklyn. LEO is a walking, talking robot who has the magical ability to to print (in plastic) any object that Carla draws. The other robots have their own special capabilities: H1-H0 prints in metal, Sinclair-10 can find and print objects from a huge catalog of designs, and the others (including AL1C3-D, IRIS-7, and NiXie) have unique talents, too. Readers can come along for the journey, too: all of the objects in the book are printable one way or another.