The online and offline hybrid teaching system of 3D printing technology and application courses is a combination of the online platform of "Super Star Learning APP" and the offline platform of "Internet + 3D Printing Innovation Practice Course" to solve the problems of independent innovation due to offline class time limitations and make up for the shortcomings of offline 3D printing technology teaching methods, so as to improve the complete process of students' cognitive training to basic practical training to innovative practical training, and exercise students' independent innovation ability to propose, analyze and solve practical problems. Improve the teaching quality and teaching effectiveness of engineering training courses.