How Rapid Prototyping Works: Additive Manufacturing Principles and Layer-by-Layer Production

Unlike traditional machining methods such as turning and milling, which remove material to create a part, rapid prototyping is based on additive manufacturing. It forms parts by adding and bonding material layer by layer until the final three-dimensional shape is produced.

Rapid prototyping follows the principle of discrete layered manufacturing. Based on a three-dimensional CAD model, the part is sliced into many thin layers according to the requirements of the selected process. In this way, the original three-dimensional digital model is converted into a series of two-dimensional cross-sectional profiles with very small thickness.

After slicing, the data is processed further and manufacturing parameters are added. Under the control of a numerical control system, each thin layer is produced in sequence in a planar manner, and the layers are then bonded together to form the complete part.

In essence, rapid prototyping is based on the principle of growing or adding material. The layers are stacked one by one from the bottom upward until the part is finished. Although there are many different rapid prototyping technologies, all of them use this same basic layer-by-layer approach. The main differences between the methods lie in the type of material used and the specific way each layer is formed.