For STEM & real-world learning: Part of the 3Doodler start STEM series, you can make and build working models of real-world mechanisms and learn about how they work. Kids become engineers as they build working models of progressing difficulty level. Buy on Amazon: _____ Subscribe: Facebook: Instagram: Also, check out our UPWARDS 3D PEN BLOG for the latest in 3Doodler and 3D Pen news - 3Doodler Online Shop: 3Doodler Amazon Store: 3D Pen Tutorial and Stencils Library: The Best 3D Pen for Students -