A Discretized Paraboloid

This is based on the plot Z= - (X^2) - (Y^2) (known as a paraboloid) but instead of being a continuous surface, I've discretized it so that it is formed from a collection of varying height square prisms.

Three STL files included:
Paraboloid.stl is for a machine with a single extruder. it is formed from 16x16 square prisms, where each square is 3mm per side.

ParaboloidOddSquares.stl and ParaboloidEvenSquares.stl are used for a dual extruder machine so that every other square is a differe