Origami Cup Volume
Someone on the Origami Forum asked about the maximum volume of water that a traditional origami cup can hold, so decided to do some calculations.
I used volumes of conical frustums to get a rough estimate.
In the end, for a 15cm paper, it holds between 60.4mL ~ 68.8mL.
Afterwards, decided to check my work by actually putting water into a folded cup. It held about 65 mL of water so I think I didn't make any mistakes... :P