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3D printing technology is a rapid prototyping technique. A 3D printer, also known as a three-dimensional printer, is a device that uses digital model files along with powder made of metal or non-metallic materials; it melts this powder layer by layer and then solidifies it to create three-dimensional objects. Currently, 3D printing is being applied in various fields. As a new type of technology, it has also been successfully applied in the metal materials industry. Especially high-end customized products, such as auto parts, aerospace components, cement, electricity, etc. More and more companies are using 3D printing technology to produce custom parts and products, with advantages including faster turnaround times, greater flexibility in manufacturing complex structures, lower costs, and excellent results. The biggest difference between a 3D printer and a traditional printer is that it uses real raw materials; data along with these materials are fed into the machine, which then creates the product layer by layer according to the program. There are many types of stacked thin layers, and the types of media that can be used for printing are diverse, ranging from various plastics to metals, ceramics, and rubber. The raw material for 3D printing is metal powder, which has extremely strict requirements regarding the oxygen content that contributes to the formation of the parts. To prevent oxidation during the molding process, the equipment needs to keep the oxygen content at a very low level. If the oxygen level in the molding warehouse is too high, 3D printer parts can suffer severe oxidation under high-temperature conditions. During the printing process, phenomena such as spheroidization and black smoke emission can even lead to explosions, posing safety risks. To ensure the efficient operation of 3D manufacturing systems and maintain high quality, 3D printer manufacturers use a variety of sensors and monitoring devices in their machines. Oxygen sensors and oxygen analyzers are used to monitor oxygen concentration during printer operation. Gongcaiwang recommends a micro-oxygen analyzer/sensor: the Southland OMD507 from the United States, designed specifically for 3D printing. It features intelligent microcontrol technology, offering high accuracy, good stability, a long service life, low power consumption, a compact size, a simple structure, as well as ease of use and maintenance.