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Violinist Sarah Valentiner (left), 13, points to her violin bow while Northern Illinois University engineering associate professor Federico Sciammarella (right) looks at the prosthetic model that NIU engineering student Oluseun Taiwo (center) made for Valentiner during a prosthetic model fitting in the 3-D printing lab on August 11, 2016. Taiwo has been working for three months printing prosthetics on the 3-D printer to help Valentiner, an eighth grader at Huntley Middle School in DeKalb, Illinois, have more range of motion while she plays the violin.