In the heart or core mold mold agriculture (less than 5 mm) taper angle at least about 0.25° each side, when mold and core crush depth increased from 1 to 2 inches (50.8 mm ÷ 25.4) should taper angle increased to 2° on each side- With hard materials such as Polystyrene, Acrylic, ... the minimum taper angle is also 1.5°
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