First, because plaster doesn’t flex, which means you can’t wiggle your wax out of undercuts in the mold without distortion (or breaking the mold). Plaster of paris is NOT an appropriate mold material for every component in your casting library. Basic shapes (such as the paisleys in the picture at top). So what do I make plaster of paris mastermolds of? (Another choice for one-offs: Make the mold out of reusable materials such as Gelflex, Elastak, or Composimold.More about that in another post.) Plaster molds let you make a LOT of waxes very quickly, and because they’re so inexpensive, they are also a good choice for one-off parts that you’ve no interest in making again.
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