How to make a 3D origami rocket

(page 10)

17th picture of 3D origami rocket

17.

Apply the "inside reverse-fold" of the step #16.

Prepare to apply a valley-fold.

18th picture of 3D origami rocket

18.

Apply the valley-fold of the step #17.

Prepare to turn the origami rocket model over.

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If you have a difficulty in these steps, you are welcome to write a question below.