Every year at the World Robotics Competition in St. Louis MO people get these awesome earrings. Since we have not been to Worlds yet and they are awesome, we had our CAD designer model them to be printed. They need to be printed separately and take quite a bit to make, despite their size. Enjoy!
UPDATE: We've added a gear to replace the circle. It looks cool! Try it out.
If printed on a HBP a raft is not necessary. The raft just leaves marks on the plastic and takes away from the slick-ness. Remember to change the filament out for each part, red for the triangle, white for the circle and blue for the square. It takes about 30 seconds of extruding to clear out the previous color completely. The circle has a slot, allowing the other pieces to slide in easily.