Every origami beginner yearns to make 3D models once they are quite familiar with the art, but we all know it's not as simple as it seems. It takes a lot of dedication and an equal amount of patience blended with creativity to carve out a flawless origami design. But if you have acquired that position in your origami journey and are hoping to start 3D designs soon, then you should take out some time to watch this video link that shows the basic 3D folding techniques to make complex 3D structures.
Click on this and get a gist of what is all about 3D folding and how small pieces of paper are folded and eventually altered into a complex origami model.