Basic Steps in Rapid Prototyping: Slicing, Layered Manufacturing, and Post-Processing

Rapid prototyping generally includes three main stages: discrete processing or slicing, layered manufacturing, and post-processing. These steps form the basic workflow for transforming a three-dimensional digital model into a physical part.

1. Discrete processing or slice generation
After the build direction is selected, the three-dimensional solid model, usually in STL format, is divided into layers by specialized slicing software. In other words, the model is sliced along the selected build direction, and the contour information of each individual layer is generated. The thickness of each layer corresponds to the thickness of one deposited layer during the actual manufacturing process.

Because slicing breaks the original surface continuity of the CAD model in the build direction, some model information is inevitably lost during this process, which can lead to dimensional and shape errors in the final part. For this reason, sliced data usually requires further processing and optimization in order to reduce visible stepping and dimensional deviation.

Layer thickness has a direct influence on surface roughness and profile accuracy. The contour of each layer is made up of a series of intersecting line segments, which means the sliced model is only an approximation of the original geometry. Information between layers is lost during stratification, and the greater the layer thickness, the greater the loss of detail. As a result, thicker layers usually produce larger profile errors and rougher surfaces.

2. Layered manufacturing
Once the sliced data is generated, it is transmitted to the machine control system. The selected rapid prototyping process is then carried out under computer control, building the part layer by layer until a complete three-dimensional product is formed.

3. Post-processing
After the part is built, suitable post-processing methods are used according to the specific manufacturing process and material. Post-processing may be necessary to improve surface finish, dimensional accuracy, mechanical performance, or overall sample quality.

In summary, rapid prototyping converts a digital model into a physical object through slicing, layered production, and post-treatment. The quality of the final part depends heavily on slicing accuracy, layer thickness selection, manufacturing control, and the effectiveness of the post-processing method.