3D printing, also known as additive manufacturing, is a general technology that constructs objects by layer-by-layer printing based on digital model files and using bondable materials such as powdered metals or non-metals. The 3D printer will slice the digital model, and then let the print head repeatedly lay the material on the printing plate according to the pre-set trajectory and fuse the continuous material layers until the final three-dimensional model is formed. Fused deposition technology (FDM, Fuse Deposition Modeling) and light curing technology (SLA, Stereolithography) are the two most common 3D printing technologies on the market. Because the two technologies have a long history of development, both professionals and amateurs generally use these two technologies as entry options when they come into contact with 3D printers, so they are also the most mature 3D printing technologies at present. Whether it is for prototyping, model display or general parts manufacturing, although both can print similar parts for users, it is still necessary to choose the most suitable 3D process and materials in the actual production process. Pay attention to a lot of details. Let's compare the advantages and disadvantages of these two processes and when to use them.