Mendel: Prusa durable z-axis motor coupling (Q50685)

This is a design for a new, more durable flexible coupling (http://en.wikipedia.org/wiki/Coupling) for use on the z-axis motors in the Mendel: Prusa RepRap machine design. The design allows for 2-3 degrees of play, but can be adjusted depending on how it's machined. Please see the following YouTube link that shows the an animated CAD simulation of the design: http://www.youtube.com/watch?v=PQEHnb5eVaE and here is the design manufactured and in use: http://www.youtube.com/watch?v=Hu32DFF1TXY The RepRap machine filmed in the above video is one of the two Mendel: Prusa machines located at the Digital Manufacturing Laboratory in Bath. http://digitalmanufacturinglab.com/