This document discusses the math behind 3D printing. It explains that 3D printing involves constructing a three-dimensional object from a CAD model by depositing and joining material under computer control. The document outlines that several areas of math are important for 3D printing, including geometry, trigonometry, calculus, linear algebra, and topology. It provides examples of how each area of math is used, such as using geometry to create 3D models, trigonometry to calculate angles and distances, and calculus to optimize the printing process. The document also briefly discusses current and potential future applications of 3D printing.