About this 3D model

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=PQEHnb5eVaEand here is the design manufactured and in use:http://www.youtube.com/watch?v=Hu32DFF1TXYThe 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/