Oh._. I usually have to hold it there for about 10 minutes._. that way there is some pressure to it but not enough to damage it._. then I rig it up so then it braced against something for overnight._. You might be able to use toothpick if you really have to._. (Use them inside of the triangle pieces._.) I only had to use them for Mr. Krabbs' arms._.
I know it was a joke, I never really liked to make that type of origami just because it's really one shape stacked but non the less good job I love traditional origami made from a single piece of uncut square paper but with 3Do it's imagination at work. One thing I love to see and or do is to go mini when I get good or "bored" with something you should try it with 3Do and not to "spam" an image it's just more of an example [link]