The primary goal of injection mold design is to create a high-quality part that can be manufactured efficiently and ejected without damage. Successful mold design relies on a "trinity" of core concepts: uniformity undercut management 1. Fundamental Design Principles Uniform Wall Thickness
: Rib thickness should be 40–60% of the nominal wall thickness to prevent sink marks on the opposite surface. The Anatomy of a Mold injection mold design guide
: Use ribs for strength instead of thick sections. Rib thickness should typically be of the main wall thickness to avoid sink marks. The primary goal of injection mold design is
| Part weight | Runner diameter (round) | |-------------|-------------------------| | <10 g | 2–4 mm | | 10–100 g | 4–6 mm | | 100–500 g | 6–10 mm | | >500 g | 10–15 mm | Slide travel = (shut height) × tan(angle) –