Cardioid Sphere 1

Derived from the cardioid (a heart shape formed by a point on a circle rotating around another circle), this model has circles raised at each tangent line to the cardiod, forming a sphere. The idea came from fdecomite, also on Shapeways.  This sort of design can also be made as an epicycloid with more than one cusp.  A link was added at the diameter to stabilize the largest circle.