Hyperboloid Cup

A video demonstration of prefolded patterns:


Today I'll show you how to make a hyperboloid cup for my first instructable (Paper Egg)
The great thing is you don't need to glue and cut (except of two for the right format). But maybe it's a bit hard for you to make it, unless you don't have folding experiences.
This model is based on the fujimoto cube method. Kasahara discovered the mathematical solution, how to use the method for several kinds of prisms and polygons. I would recommend to read the book "Amazing Origami" by Kasahara

-red: valley folds
-blue: mountain folds
-black: cutting edges


 

At first you prefold everything of the creasepattern. In the screenshot you can also see the description of the parts.

At first you begin with the bottom. It's a kind of screwing and twisting from the both sides at the same time

When you twist the bottom you get something that looks like a cup.
From the top you see the notations A, B, C (D is not important)
Bring A to the outside and B to the inside like shown in the pic.

Bring C+A , D+B (inside of the cup) together and close the gaps. Twist the cup into a hyperboloid shape.

The last step is to fold the frame. Fold it, tuck it inside and you are finished!