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Re: Making molds!
Although there are many types of urethane, generally it is a pourable 2-part compound that is somewhat viscous, a little thinner than honey, but thicker than pancake syrup. It warms a little while curing, and shrinks a little especially in thicker casts.
Both ABS and PLA have enough temperature resistance to take a direct casting of most urethane. Surface finish may be less than desirable, and mold release agent is mandatory.
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