This is a model of the Mars Pathfinder and Sojourner lander and rover which landed on Mars in 1997. Pathfinder prints in one piece in its folded configuration. Once the support material is removed, the the side panels can be opened and closed. The Sojourner rover can fit inside the model while folded.
***Be careful when first unfolding the model as support material is printed inside of the hinges. Do not force a panel open. If one gets stuck, use pliers to carefully rotate the axel itself and it should come loose. Once opened for the first time, the panels should be able to move freely.