Monkey Saddle

As a follow up to the last post, the previous saddle is not practical for a monkey, as it does not leave room for a tail. Thus the following monkey saddle:

Mathematically, the graph of the function f(x,y) = (x^3 - 3 x y^2)/2. It has the property that at the center it is even flatter than the standard saddle.

Visible calculus:  The print ended up having some issues at this center point due to overhangs, whereas this didn't happen in the standard saddle. First printing issue to delight me.

Technical note: The standard monkey saddle function does not include the 1/2, but this made for too steep a figure, which started to break off at the corners. Next time I will split the difference and make the factor perhaps 3/4 to address the overhang problem.