Thing of the Week: Sarrus Linkage

Now that low-cost 3D printing is really on the rise, increasingly complex projects like this stunning execution of a 2D positioning system are becoming more common.  The implications of this low-metal setup are pretty huge, especially for the RepRap, but what gets me is how this complex machine is now part of the Creative Commons.  As personal fabrication becomes more popular, open designs like this one will raise the baseline functionality of, well, just about everything.