Customized version of http://www.thingiverse.com/thing:175490 
This Thing is made with the Version 1 of the sinoid sphere plotter using this functions: 
function rx(a,b) = cos(a )*cos(b )*gr ; 
function ry(a,b) = sin(a)*cos(b )*gr; 
function rz(a,b) = sin( a*2 ) *gr;