3D printed design models have many advantages, mainly manifested in the following points:

1. Rapid prototyping: 3D printing technology can quickly transform design concepts into physical models, greatly shortening the time from design to prototyping.

2. Can be used for complex geometric shapes: 3D printing can easily produce complex, multi-layered and organic shapes that are difficult to achieve with traditional manufacturing methods, which provides unlimited possibilities for innovative design.

3. Customized production: 3D printing is very suitable for small batch or single-piece production, and can easily achieve personalized and customized products to meet the special needs of consumers.

4. Reduced waste: Compared with traditional manufacturing methods, 3D printing is manufactured on demand, reducing material waste and being more environmentally friendly.

5. Cost-effectiveness: For some applications, 3D printing can reduce production costs, especially when a small number or complex parts need to be produced.

6. Design freedom: Designers can explore and optimize designs more freely because 3D printing is not limited by tools and can achieve finer details and internal structures.

7. Repair and Replacement: 3D printing makes it easy to manufacture replacement parts. For old products or rare parts that are no longer produced, replacement parts can be quickly manufactured.

8. Education and Research: 3D printing provides an intuitive learning tool for education and research. Students and researchers can directly operate and analyze 3D printed models.

These advantages make 3D printing widely used in many fields such as engineering, medicine, art, and architecture.