I made an example of how to simulate the mechanism of the Hoberman ‘Switch Pitch’ toy in Kangaroo.
switchpitch_example.gh (38.9 KB)
It is made up of 12 bars meeting at the corners of a cube and connected by revolute joints (achieved in Kangaroo by making a pair of shared points along the hinge axis for each pair of connected rigid bodies).
In the toy there is a set of bevel gears at each node, which ensures all 3 connected elements fold evenly. This is achieved in Kangaroo with an EqualAngle goal.
Some references on this mechanism: