120 Unit Rhombic Icosahedron with Concave Hexagonal Rings

Since in recent days, I have been trying out many modular origami. I wanted to try out the inverse of the previous model I had folded - the 120-unit rhombic icosahedron using Tomoko Fuse's double-sided convex hexagonal rings. This time, I had used concave modules. As before, this one is also made of 120 modules.

This model turned out to be one of my most challenging. Mainly because this was like assembling the model upside down! And initially quite a few times, I started assembling the pieces as I would a regular icosahedron, with the cones pointing out. Then I had to undo and reassemble correctly. A lot of painful rework! Also, as the assembly progressed, I found that there were a few instances when I just couldn't get that little tab (the one that inserts into the adjourning section?) in place. Finally, I just gave up, but the model is so tight that there is no way the pieces will slip out. I can even use it as a football I think :)

Model Details:

Model: Double-sided Concave Hexagonal Ring 120 unit Rhombic Icosahedron 

Creator: Tomoko Fuse

Book: Unit Polyhedron Origami
 
Author: Tomoko Fuse
 
Difficulty Level: Complex

Paper Ratio: Rectangle in ratio 1:2

Paper Size: 3.4 inches by 1.7 inches

Model Size: ~4 inches in diameter

Modules: 120