AI. SpaceFactory of New York and Pennsylvania State University of College Park print subscale habitat structures at NASA's 3D-Printed Habitat Challenge, held at the Caterpillar Edwards Demonstration & Learning Center in Edwards, Illinois, May 1-4, 2019. The habitat print is the final level of the multi-phase competition, which began in in 2015. The challenge is managed by NASA's Centennial Challenges program, and partner Bradley University of Peoria, Illinois. Caterpillar engineers work with specially modified radio controlled scale models that accurately replicate moves of full scale caterpillar equipment.