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

The Rhombic Icosahedron from Tomoko Fuse's book 'Unit Polyhedron Origami' is folded from 120 rectangular units. The assembly of this model is a serious test of patience! Folding the units took me a couple of days - it is no joke folding 60 yellow and 60 blue units! Assembly took me nearly half a day, a whole lot of patience and the aid of a couple of toothpicks. I was so tempted to tear the whole thing when I was assembling the last few pieces. Only the thought of folding another 120 pieces kept from doing it :)

The model is very sturdy. Well, I had used 80 gsm paper, so that was a very good decision in my view. Before assembling the model, I completed the 12 5-unit yellow centers first. Then I proceeded to add the blue units in the 3 and 4-unit assembly. In fact, I think if I had assembled the 3-unit blue sets as well, that would have made it even easier.

Altogether, a good, challenging model for me. There is another 120-unit model made from concave units, which would be the inverse of this model. I hope to do it. Some time, hopefully in the near future!

Model Details:

Model: Double-sided Convex 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: ~6 inches in diameter

Modules: 120

Tutorial: Youtube