This red plastic 3D printed model is a cylinder with a portion cut out of it. The inner surface is in the shape of the curve y = 1 + x2, rotated about the y-axis.
The object was distributed at a workshop on 3D printing at the MathFest meeting in Washington, D.C., in August 2015. It was given out in connection with a paper by Lila Roberts of Clayton State University entitled "I Can Touch the Math!" Objects 2015.3169.03 and 2015.3169.04 were collected at the same session.
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