A 3-D printer works on a piece for a guitar, books are being checked out a few feet away, students are scattered at computer terminals, two boys tease “mom” — it’s just another day at the East Hall High School media center. But Rebecca Hamby, the school’s media specialist, talked about the changes in the room — and the function of the “library” since she was a student there. The media center has been named the Judy Serritella Exemplary Media program for 2016.