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Printing a plastic mould to cast the refractory mould that forms the outer surface of the glass casting.

Firing 1 result
Refractory mould and spilt glass after first firing attempt. The parts have separated as the mould material shrank on firing, and the cores floated up in the molten glass.

Incomplete casting
The core had floated up in the mould and blocked the gate. It appeared full at the time of feeding the mould, but was in fact only half full.