I think this is the smallest I can possibly make the Earring RBS given shapeways minimum wall thickness limitations for white strong and flexible. The frame is 1mm and the rails are 0.8 mm. Yes, I know 0.7 is real minimum but I don't want to risk it. I labeled them as earrings because they could be used as fairly large earrings if you add earring hooks. Wouldn't that be cool? RBS Earrings? It is very small at 1 inch wide by 2.25 inches tall. There is a loop at the top for hooking to an earring or it will also stand on its own. A very unique earring! Don't forget that if you want it for an earring you need to purchase two (one for each ear). You'll notice that this one is a little smaller than the earring RBS I uploaded previously. To play with it, you'll need to detach the attached 5 marbles. However, it might be better to use glass or silicon beads. Watch the video. In the video I used a silicon bead and used a sharpie to color it black so that you could see it better. It's very tiny and maybe it's one of the tiniest RBSs in the world! It seems to have one little place at about the 3/4 mark where the ball if it's the wrong size wants to catch. If that's the case try a smaller or larger ball and it should be OK - anyway, that's what worked for me. I hope you like it!
older video: http://www.youtube.com/watch?v=-as24TSv2-U