Maximum Material Condition (MMC) is a useful modifier in GD&T that can help reduce manufacturing costs while still ensuring part functionality. By understanding what MMC means, how to calculate it, and how it can be applied to GD&T controls like position or profile, we can optimize part functionality while achieving more economical manufacturing. In this article, we will demystify MMC by covering its definition, symbol, formulas for calculation, and applications. Learning about MMC takes us one step further in mastering the world of GD&T.