3D printing (also called additive manufacturing) is a technology to build 3D objects by stacking materials layer by layer. Compared with traditional processing methods, it can realize personalized and complex structure manufacturing more efficiently. In robot manufacturing, many parts, such as shells, joints, gears and brackets, can be completed by 3D printing technology. Especially for some parts with complex shapes that are difficult to be processed by traditional methods, 3D printing can be easily realized, which greatly shortens the prototype design and production cycle.

When making robot parts, three-dimensional modeling is needed first. Designers use CAD (Computer Aided Design) software to create digital models of robot parts to ensure that their size and structure meet functional requirements. After the model is completed, it is imported into slicing software, which will cut the model into several layers and generate printing paths and parameters. Subsequently, the 3D printer prints layer by layer according to these data, and finally forms a solid part.
　　Material selection is the key link of 3D printing robot parts. Commonly used printing materials include PLA, ABS, nylon, resin and so on. Different materials have different strength, toughness and heat resistance, and are suitable for robot parts with different functions. For example, PLA is suitable for making exterior parts or low-load structural parts, while ABS or nylon is more suitable for making load-bearing parts.

The advantages of 3D printing in robot manufacturing are obvious. First of all, it can realize rapid prototype development, help engineers quickly verify the design and shorten the research and development cycle. Secondly, 3D printing supports customized production, which can make personalized parts according to specific needs and improve the performance of robots. In addition, in education, scientific research and small batch production, 3D printing has also greatly reduced manufacturing costs.
　　In a word, 3D printing technology has brought unprecedented convenience and innovation to the manufacture of robot parts. With the improvement of printer accuracy and the variety of materials, 3D printing will play a more important role in the field of robotics in the future, injecting new impetus into the development of intelligent manufacturing.