This 3D Printed Dual Extrusion Rhombic Dodecahedra Chain was a very cool print… This object is designed specifically for the Replicator 1 Dual printer. The individual segments of the object are spaced exactly as far apart as the two extruders on the printer. This means that if you load one color into each extruder and then enable ditto printing (which causes both extruders to do exactly the same thing at the same time, rather than working one at a time), then it prints out exactly as shown above. Kudos to Emmett Lalish, who designed this object!
The model can be found here: http://www.thingiverse.com/thing:31151 (model credit: Emmett Lalish)