Michigan Tech researchers have come up with two different portable 3D Printer systems. The first system is larger and can run for up to 35 hours on a single charge because of its large batteries. The second setup is much smaller, and fits into a suitcase. This setup can easily be carried on longer expeditions, but has less battery storage. You will find more information on both 3D printer setups here: http://3dprint.com/18836/solar-3d-printers

Below is a picture of the more portable of the two setups, featuring five 20 watt solar panels: