Here is the actual print as I got it from shapeways. To my surprise it really worked :)
This is *one* of Escher's tesselating fishes in 3D. Several of these fishes can be grouped together, so that they form a never ending pattern.
See also: http://www.quirxi.net/misc/lizard_tutorial/index.html.
1.926 w x
2.134 d x
0.758 w x
0.84 d x