With the continuous development of 3D printing technology, more and more materials are applied to multi-color or multi-material printing to meet the needs of product design, prototyping and personalized customization. Among them, HIPS(High Impact Polystyrene), as a light, easy-to-process and low-cost thermoplastic material, has gradually attracted attention in the field of two-color printing. This paper will discuss the application mode, advantages and precautions of HIPS in two-color printing.

First, the basic characteristics of HIPS

HIPS is a modified polystyrene material, which has good toughness and impact resistance, as well as good dimensional stability and easy processing. It is usually white or milky white, with a low melting point (about 200-240℃), and is suitable for sharing with many other materials, especially as a soluble supporting material when supporting structures are needed. However, in recent years, HIPS has been increasingly used in two-color printing, especially when it is used with PLA and other materials.

Second, the application scenario of HIPS in two-color printing

Two-color printing refers to the combined printing of two materials with different colors or materials in the same printed piece. HIPS is not usually used for high-temperature prints, but its good adhesion and color stability make it one of the ideal color matching materials.

1. Color matching: Because HIPS itself is easy to dye and appear white or light color, it is often used for printing white parts or light color structures, which is in sharp contrast with dark materials (such as black or dark blue PLA).
2. Functional collocation: In addition to color, HIPS can also be combined with materials with different functional characteristics (such as flexible TPU or rigid ABS) to realize the combination of structure and function.
3. Combined use of supporting structure: In complex two-color model, if one of the materials is difficult to remove the supporting structure, HIPS is often used as an auxiliary supporting material because of its solubility in limonene, thus simplifying the post-treatment process.

Third, the key points of printing settings in two-color printing

When using HIPS to print two colors with other materials, you should pay attention to the following points:

1. Nozzle temperature setting: The general HIPS recommended printing temperature is 220-240°C, which should be adjusted according to the specific brand to ensure compatibility with another material.
2. Platform temperature and adhesion: It is recommended that the heating platform temperature be 100-110°C when printing HIPS, and it is also recommended to use coated glass or PE board to enhance adhesion.
3. Cooling control: Proper cooling can reduce warping and deformation, but it should not be too strong to avoid affecting interlayer adhesion.
4. Material switching control: In two-color printing, the switching point and pumping parameters should be set reasonably to avoid material mixing or wire drawing.

IV. Advantages and Prospects

The main advantages of HIPS in two-color printing are its low cost, easy processing, stable color and can be used as a supporting material, which greatly improves the flexibility and efficiency of printing. With the maturity of double extrusion printing technology, HIPS will be more widely used in two-color or even multi-material printing.

In the future, with the development of environmentally friendly HIPS materials and the improvement of compatibility with more new materials, HIPS is expected to play a greater role in education, industrial design, artistic creation and other fields, bringing more possibilities for two-color printing.

---

Conclusion:
As an economical and practical 3D printing consumables, HIPS is gradually showing its unique value in two-color printing. By reasonably selecting material combination and printing parameters, users can easily achieve high-quality two-tone printing effect. With the continuous progress of technology, HIPS will occupy a more important position in the multi-material printing ecology.