Spider Coupling with rubber insert: 4.75mm stepper motor to 8mm threaded shaft

This thing is an printable spider coupling designed for a rubber insert. It has robust clamping, and should be well balanced if tightened evenly.

If the rubber spider is cut cut correctly, there will be axial compression cushioning, angular cushioning, and rotary cushioning without slop.

This design must be kept in compression, it will not stay together under tension.

Video showing low-speed operation, with an exaggerated angle:
http://www.youtube.com/watch?v=YA71gIn71Zk

Video showi