Hyperboloid of Two Sheets - with formula

This model shows the hyperboloid of two sheets -x^2-y^2+z^2=1. One model has the equation on it, the other does not.

This model was designed and printed by my WLU summer research student Emily Jaekle ('16). For more information go here: http://mathvis.academic.wlu.edu/2015/07/21/quadratic-surfaces-hyperboloid-of-two-sheets/.