3D打印（英语：3D printing），又称增量制造、积层制造（Additive Manufacturing，AM），可指任何打印三维物体的过程。3D打印主要是一个不断添加的过程，在计算机控制下层叠原材料。3D打印的内容可以来源于三维模型或其他电子数据，其打印出的三维物体可以拥有任何形状和几何特征。3D打印机属于工业机器人的一种。

“3D打印”这个词的原意是指顺序地将材料沉积到粉末层喷墨打印头的过程。最近此词的含义已经扩大到广泛包括的各种技术，如挤压和烧结过程。技术标准一般使用“增量制造”这个术语来表达这个广泛含义。

3D printing, also known as additive manufacturing (AM), refers to various processes used to synthesize a three-dimensional object. In 3D printing, successive layers of material are formed under computer control to create an object. These objects can be of almost any shape or geometry and are produced from a 3D model or other electronic data source. A 3D printer is a type of industrial robot.