This is an iPhone 4/4S cover with moving gears I developed for Engineers, Designers and Mechanically minded people, however it seems to attract a broader audience so I've got it here for everyone to experience.
You get this baby printed, you get a sense of achievement because you assembled it, you spin those little 1.25 module gears and admire it in awe. The gears have odd and even number of teeth just to make it that bit more challenging when working out ratios, it's a great visual to see what direction what gear is going in a gear train. You won't even have to turn on your phone and it still works.
If you're looking for the iPhone 5/5s version go HERE
If you're looking for the iPhone 5c version go HERE
If you're looking for the Samsung S4 version go HERE
Please note that 3d printing is not perfect even though I've made all adjustments to make this product fit and move as good as possible in some cases some manual adjustments may be necessary.
OPTIONAL STEP: SLS 3d Printing of Strong & Flexible Material produces a porous surface which collects dirt and grime, before assembly you may want to give the parts a light spray of clear varnish or lacquer for extra protection, especially if you're going for light colours.For further information on painting 3d products from Shapeways follow the link http://www.shapeways.com/tutorials/painting3dprintedsls