Mohammed Al Aryan is a 19-year-old materials engineering student at McMaster University in Ontario, Canada. He became enamored with 3D printing after he 3D printed some gears for a project in his first-year engineering graphics and design course, and rather than buying his own 3D printer, he decided to build one - out of K'Nex. The finished printer, which took about 6 months to build, only cost him $250. Read more at