With the development of CAD modeling and the need to create direct rapid prototypes of products, in order to better define production processes and to define changes in product design, the term rapid prototyping was created. Additive production consists of adding materials, usually layer-by-layer, and thus stacking the appropriate three-dimensional product. The very basis of additive technology is the stacking of layers of materials generated from the cross-section of the CAD product model. All differences in manufacturing methods affect the final properties of the product, such as the need for subsequent machining, dimensional accuracy, manufacturing speed, etc. The application of AP is becoming widespread and its area of application increases over time due to the active development of the process itself. Initially, AP was used to create models during the design for the purpose of product visualization in a real environment, and further development of the technology enabled the application of AP products in environments where dimensional accuracy and more demanding mechanical properties are required. With the significant development of AP in recent years, in line with other production technologies, it is possible to significantly shorten the product development process and thus save time and development costs. Some of these technologies are developed enough for the production of end products. Heat treatment of 3D printed products is created by the need for post-processing after production as well as the need to modify the mechanical properties. The heat treatment of the polymer itself must be well optimized. It can be carried out on: hot air, in salt, sand, etc.