[HarrietJones]

Pringle: https://www.google.co.uk/?q=(x*x)%2B(y-x)-(y*y)

[dheera]

No. This is a Pringle: https://www.google.co.uk/?q=(x*x)%2B(y-x)-(y*y)#q=((x*x)%2B(...

[_lce0]

now we just need to 3d print those

[RobAley]

Or hyperbolic paraboloid, to give it a non-brand name