2025-11-24 Table of ContentsI. Executive Summary: The Custom Part ConundrumII. Technical Foundations: How They Create Custom PartsA. CNC Machining: The Subtractive ApproachB. Injection Molding: The Additive/Formative ApproachIII. The Cost & Volume CrossroadsA. Upfront Investment (NRE)B. Cost Per Part (CPP)C. B