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Collection of molds we tested: (a) Outer molds and (b) corresponding inner molds for the 50-mm sphere, 100-mm sphere, top half of bladder, and bottom half of bladder. (c) Visualization of the gap for sandwich molding (shows the flat base, alignment tabs, and positioning of weights used during molding). (d) Closeup of the textured surface of the molds caused by the finite resolution of the three-dimensional (3-D) printer.
