Parametric Tetrapod in OpenSCAD

I’m starting a new shrimp tank soon and I want to fill it with hollow tetrapods, commonly used for reenforcing shorelines. Their stable, interlocking shape combined with oblique surfaces for dispersing wave energy is idea. I just think they look cool, and think a carpet of them in a shrimp tank is both very aquatic (I see these all over shorelines I love). Tetrapods in Latvia. by [Andrzej…