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The way the piece is made can either minimize cracking, or contribute to cracking. For example, if you sit an unfired pot inside down (on its rim), you will put stress on the rim. A crack may not appear right away, but it could show up later as the pot dries more or when it is fired. So it's a good idea when turning pots upside down to place the rim on a piece of soft foam.
Different clays can handle different amounts of stress without cracking.
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