This model shows the hyperboloid of one sheet: x^2+y^2-z^2=1. The equation is imprinted in the surface. There is a second .stl file showing the surface without the equation.
This model was designed and printed by my WLU summer research student Emily Jaekle (’16). For more information see http://mathvis.academic.wlu.edu/2015/07/16/quadratic-surfaces-hyperboloid-of-one-sheet/.
Sourced through Scoop.it from: www.thingiverse.com