The fourth and the last frame of our 3D cube models. Using z0 cards. And also to add some staircase feature into it. In my opinion, this model is the most nicest out of the other three which use only paper. And the easiest to put together as well. I think it is because the z0 cards are thicker and stable than paper which is harder to manage, especially after being cut. So out of the four, this cube model is my favourite.