Print-In-Place Parameterized Sarrus Linkage

The end plates of a Sarrus linkage stay parallel and move along a straight line. This allows linear motion to be created without linear guides. Video is here: http://vimeo.com/72531195

This model can be printed (nearly) fully assembled and without any support material. Also, this model can be modified in Customizer to produce linkages of any length, as well as linkages with two or four sides.