In order to have the largest potential process window when injection molding with multi-cavity tools, it's important that all the cavities fill at the same time. Cavity- to-cavity and shot-to-shot variations will make it difficult to consistently mold flash-free, fully packed parts with uniform dimensions. Although hot runners can provide huge benefits to the molder, they do increase the complexity of the tool and add to the list of potential root causes of a filling imbalance.
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