Multi Jet Fusion (MJF) 3D printing is widely known for producing high-quality, functional parts quickly and consistently. One of the standout features of MJF technology is the surface finish it delivers compared to other additive manufacturing methods. While not as smooth as injection molded parts, the surface quality of MJF 3D printing components is often sufficient for both prototyping and end-use applications.

Typical Surface Texture

MJF parts typically have a matte gray finish with a slightly grainy texture due to the fine powder used in the process. The surface is uniform and consistent, without the prominent layer lines seen in some other 3D printing methods like FDM. This makes MJF particularly suitable for parts that need a clean and professional look right out of the printer, especially when aesthetics matter.

Post-Processing Effects

Although the raw finish is acceptable for many uses, MJF parts can undergo post-processing to improve their appearance and functionality. Common treatments include tumbling or bead blasting, which smooth out the surface further, and dyeing, often used to produce a deep black finish. For applications requiring a sleeker or more polished look, vapor smoothing or coating can be applied to give the part a more refined texture and increased durability.

Comparison to Other Technologies

Compared to Selective Laser Sintering (SLS), MJF generally provides a finer and more uniform surface due to its unique fusion process and material control. When compared to Fused Deposition Modeling (FDM), MJF parts show far fewer visible layers and rough edges, resulting in a more refined finish suitable for consumer-facing products.

Impact on Functionality

The surface finish of MJF parts also contributes positively to mechanical performance. The uniform texture aids in stress distribution and reduces weak points, which is particularly important in functional prototypes and production parts. In many cases, the surface is good enough to allow for friction-fit assemblies, snap fits, and even minimal sealing without additional treatment.

Conclusion

MJF 3D printed parts offer a high-quality matte surface finish with fine texture and minimal layer lines. While the raw finish is suitable for many applications, additional post-processing can enhance the look and performance further. Whether used for prototyping or final production, the surface quality of MJF parts makes them a preferred choice in industries where both appearance and function are critical.