I laid the model flat, because when I tried printing it upright, it only printed the sides of each step but not the whole step. Also, the steps are not connected to each other, so I think if I were to remove the supports, I would have a bunch of individual squares. Despite all this, when viewed from the right angle, it still recreates the optical illusion. ps My printer somehow managed to get a y-axis shift partway through. I think it might have been caused by a leveling wing-nut catching against the frame.