Paper used in this video: 18 squares with a side length of 7.5 cm (3 in), kami
Finished model: diameter of 8.5 cm (3 3/8 in), depth of 4.25 cm (1 5/8 in)
This video describes how to fold a fantastic modular origami model called "Hex Wheel" designed by Ira Fine. Ira also calls it a hexa-octahedron, due to its geometry.
Ira kindly gave me permission to make this video accessible to you.