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Aim for a "sweet spot" where your part weight is 20–80% of the machine's maximum shot capacity. If the ratio is too low, the resin may degrade; if too high, it leads to inconsistent melt quality.

A well-documented history is often more important than the machine's age. Used Injection Molding Machine Buying Guide - Meadoworks buy used injection molding machine

Check for leaks around pumps and valves. Listen for unusual whining or knocking sounds from the pump, which often indicates wear. Aim for a "sweet spot" where your part