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Left #1: A thrown mug with a slip-cast handle.
Right #2: A slip-cast mug with a pulled handle.
#1 is much less likely to crack on drying? Why? The much higher drying shrinkage of the plastic throwing clay is the main issue. A cast mug, stiff enough for handling, may have as little as 1% shrinkage left while the pulled handle being attached could have 5% or more. While #1 has survived, stresses lurk within seeking relief (e.g. when bumped). The situation is much more favourable with a cast handle on a thrown mug. At leather hard it may have 3% shrinkage left. A fresh-out-of-the-mold cast handle would have about the same - so they will dry happily together. Of course they also need to have similar firing shrinkages so the kiln does not put the join under stress.
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Mug Handle Casting
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