What is a common characteristic of additive manufacturing processes?

The characteristic that defines additive manufacturing processes is that parts are produced layer by layer. This layering process is fundamental to the nature of additive manufacturing, distinguishing it from traditional subtractive manufacturing methods, where material is cut away from a solid block to create an object. In additive manufacturing, the process begins with a digital model from which layers of material are sequentially added to build the final product. This allows for complex geometries that may be impossible or too costly to achieve through traditional manufacturing methods.

Additionally, the layer-by-layer approach can contribute to material efficiency, as only the necessary amounts of material are used, reducing waste. It also enables customization and rapid prototyping, as changes can be made easily in the digital design without needing new molds or tooling. Thus, the layer-by-layer construction is a core aspect of what makes additive manufacturing a unique and innovative approach in the field of manufacturing.