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10-01-2020, 11:16 AM #5
The sand used for sand casting is quite different from ordinary sand. The grain size is much much smaller, and the better types (like Petrobond) have an oily coating that prevent molten metal from sticking to them. The oily ones get a bit smelly when you pour molten metal into them as some of the oil burns off, but that shouldn't be a problem with PLA. I'd guess that the non-stick coating in Petrobond would also work with PLA, but there's only one way to find out.
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