OpenSCAD 3D Surface Plotter (Q91774)

Could there be anything more fun than drawing 3D surface plots? Yes, you can 3D print 3D surface plots and hold them in your own hands! (Indeed, I wrote this OpenSCAD program in 2011 for a math teacher who wanted some tangible 3D plots for a blind student.) And, it would be REALLY COOL to mod this somehow for dualstrusion to produce AWESOME contour plots. For example, print every fifth layer in a contrasting color. The one in the photo was done manually using the Jetty Firmware's "Pause at Z-height" and changing out the filament in a single extruder. At any rate, be the first carbon-based life unit on your block with a Lego(tm) set which includes z(x,y) = cos(sqrt(x^2+y^2))/(1+x^2+y^2) Or, print your own doll house washboard with z(x,y) = cos(|x|+|y|).