How to make an origami cube with a hinged top

(page 10)

17th picture of origami cube with a hinged top

17.

Apply the 90 degrees "mountain-fold" of the step #16.

Prepare to apply a "valley-fold" .

18th picture of origami cube with a hinged top

18.

Apply the "valley-fold" of the step#17.

Prepare to rotate the origami cube model by 180 degrees.