short shot injection molding - Custom Plastic Injection Molding | High Precision Parts & Mold Design

Short Shots in Injection Molding: A Buyer’s Guide to Root Causes, Mold Fixes & Supplier Vetting?

Incomplete plastic parts waste your money. If you ignore short shots, production delays will kill your product launch. Here is how we fix this problem for good. A short shot happens when molten plastic fails to fill the mold cavity completely. To…

Alex Yu

Aug 28 2026

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How to Solve Short Shot in Injection Molding: 13 Root Causes & Proven Solutions

What Is Short Shot? Short shot (also called incomplete filling, underfill) occurs when molten plastic fails to completely fill the mold cavity before solidifying. This defect commonly appears in thin-walled sections, complex geometries, or flow-path endpoints, resulting in missing material and non-conforming…

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