Multivariable Calculus - Riemann Sum - Double Integral

This is a model for a Multivariable Calculus Course for Riemann Sums of Double Integrals. The Function that was used was z = 0.2(x^2+y^2-1). It is based on a model created from a GeoGebra Visualization Riemann MV. https://www.geogebra.org/m/qcnq87s5 You can change the number of prisms in GeoGebra and then make another .stl out of it if you would like as well.