Kudos for an outstanding mod of the cube gears! I printed mine with copper and aluminum metallic PLA filament on Makerbot 2. Had a little trouble getting the pegs into the large corners so it is a little loose and skips gears but I should be able to adjust. The large globe-in-globe corner is the challenge: how to hold the center firmly enough to get the pin in!
Metallic PLA (copper and aluminum) prints at 210deg, slowed down travel speed to 100mm/sec for cleaner high-res print.