This is a model of a Gyroid Surface.

What's a Gyroid?

https://en.wikipedia.org/wiki/Gyroid

"A gyroid is an infinitely connected triply periodic minimal surface discovered by Alan Schoen in 1970."

Glad we cleared that up.

To put it another way, it's a surface defined by the signed distance field:

d = sin(x) * cos(y) + sin(y) * cos(z) + sin(z) * cos(x)

This model is formed by creating a thin shell about that surface. It's defined over all 3d space, but I've cut out a cube of that space to be printed.

The design is parameteric - and I've included the source if you wish to modify it.

Note: This is not OpenSCAD. It's a program written in Go. The main library and code examples can be found here:

https://github.com/deadsy/sdfx

About Go: https://golang.org/