A evacuative casting resin

I am an old hat at 3d printing and sla, but new to forging, just built my first melting forge. I would like to see a resin that works by evacuating when molten metal is poured on it while encased in casting sand. I have done this already by carving shapes out of pink foan from home depot and wax, but would love to make imore intricate shspes with my form1+ And do the same!

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