GEARS EMBEDDED IN company CARDS
In [Bre Pettis]’s newest “things” video, he talks with [Adam Mayer] about his geared company cards. [Adam] has developed several versions of these cards that have functional gear systems in them. There appears to be a easy two gear one and a much more complicated planetary gear set up. The designs have been uploaded to Thingiverse, so you can download and build your own.