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August 20, 2014

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A 3-D printer at Westtown High School prints out parts for an artificial hand designed by Westtown engineering students for eight-year-old Steele Songle, April 18, 2014, in West Chester, Pa.

Ron Tarver / Philadelphia Inquirer/MCT

A 3-D printer at Westtown High School prints out parts for an artificial hand designed by Westtown engineering students for eight-year-old Steele Songle, April 18, 2014, in West Chester, Pa.