Molds themselves have to be constructed so that the various parts can be fitted, the air escape as the material is injected and then a coolant allowed to flow through to bet the entire mold down to a temperature to cool the product efficiently so that it hardens sufficiently to be removed and stay in shape. Thus once a mold is made the limitations are the injection and the cooling as to the number of products that can be produced. Obviously the unit cost per product is massively reduced the longer the run as molds may wear over time but usually will last for long runs of many tens of thousands of products before needing maintenance.
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