This models shows the paraboloid z=x^2+y^2 with its formula. There is a second .stl file giving the surface without a formula. This model was designed and printed by my WLU summer research student Emily Jaekle ('16). See http://mathvis.academic.wlu.edu/2015/07/20/quadratic-surfaces-paraboloids/ for more information.This object was made on a MakerBot2X. We used the following settings: 2 shells 0.20mm layer height 10% infill (hexagonal pattern) Color matched supports Raft on We printed the surface upside down. This worked really well.