This article explores the detailed cost comparison between 3D Printing and Injection Molding for small production runs, emphasizing 3D Printing's advantages in cost, speed, and design flexibility for orders below 1,000 units. Injection Molding emerges as the cost leader for larger volumes due to lower per-part costs despite higher upfront tooling. Understanding these dynamics helps manufacturers optimize production strategies with the best fit for volume, complexity, and timelines.