Injection molding sink marks are caused by uneven wall thickness, thick bosses and ribs, poor gate design, insufficient packing, uneven cooling, and material shrinkage. This guide explains how to prevent and fix sink marks through part and mold design, process optimization, material selection, and early DFM analysis.

Learn the fundamentals of injection mold gate design, including four common gate types, gate placement rules, sizing formulas, and solutions to common molding defects. This guide helps engineers choose the right gate design, improve filling and packing, reduce defects, and minimize mold rework.

DFM analysis helps identify injection molding design issues before mold manufacturing begins. It can reduce the risk of sink marks, warpage, and other defects, lower mold costs, minimize mold trials, and shorten the overall development cycle.

Injection mold cost can range from a few thousand dollars to over $50,000 depending on part size, complexity, material, tolerance, cavity number, and production volume. This guide explains the 10 key factors that influence injection mold pricing and how smart design decisions, such as DFM optimization, can help reduce tooling costs without affecting product performance.