The goal of this paper is to describe how modular origami can be utilized in a geometry classroom not only to enhance student understanding of two-dimensional concepts, but also as a tool for three-dimensional problem solving. All participants in this workshop will create a Sonobe unit and explore the relationship between the original paper and the final folded unit. Some workshop participants will create more Sonobe units and put them together to form polyhedra. The other participants will be charged with finding the volume of the polyhedra that have been created.