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HydroSpan 100, from Houston-based Industrial Polymers Corporation, is billed as “a 3 dimensional copy machine enlarging any shape or design in near perfect proportion and detail.” Shown uppermost, a Morgan silver dollar from 1896, enlarged via three generations of HydroSpan 100 casting to about the size of a salad plate. To use it, two components are mixed and poured into a conventional silicone mold. After curing for 24 hours, the resulting casting is soaked in water for a period of several days, swelling it uniformly to 160% of its original size. The enlarged casting can then be remolded and the process repeated as many times as necessary to achieve the desired final size. Industrial Polymers also manufactures a shrinking casting resin if you want to go down the rabbit hole, instead.

Sean Michael Ragan

I am descended from 5,000 generations of tool-using primates. Also, I went to college and stuff. I write for MAKE, serve as Technical Editor for MAKE magazine, and develop original DIY content for Make: Projects.


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