Customizable Escher Sand Lizard

This model can be used to impress an Escher design into a lonely deserted beach to confuse passers by...

A smaller version will also make a fine cookie cutter...

The Customizer interface allows you to set wall thickness and overall size, as well as the internal detail offset for cookies.

Also see it tiled for your amusement... but only print one :)

Originally for the Summer Steam Math Challenge (but finished it too late).