The sphere is approximated by 20 very thin solid cylinders. This illustrates the disk method of finding the volume of the sphere, commonly found in a Calculus II course. This model was designed and printed by my WLU summer research student Emily Jaekle ('16). A full description of the build can be found at http://mathvis.academic.wlu.edu/2015/06/22/volumes-by-slicing-disk-method/ This object was made on a MakerBot2X. We used the following settings: 2 shells 0.20mm layer height 10% infill (hexagonal pattern) color matched supports raft off We had some problems printing this shape, the first time the bottom disk came off. The second time it worked fine - we just needed to wait longer before removing it from the build bed.