Which materials are commonly used in MJF 3D printing, and what are their key properties?

Multi Jet Fusion (MJF) is a powerful industrial 3D printing technology developed by HP that produces high-quality, functional parts with excellent mechanical properties and surface finish. A major factor in MJF’s versatility is the range of materials it supports, each selected for specific use cases and performance requirements. Here’s a look at the most commonly used materials in MJF 3D printing and what makes them valuable.

1. PA 12 (Nylon 12)

PA 12 is the most widely used material in MJF 3D printing. It offers excellent strength, chemical resistance, and dimensional stability. Its fine grain allows for high detail resolution and smooth surface finishes, making it ideal for functional prototypes and end-use parts.

Key properties:

• High tensile strength

• Good fatigue and impact resistance

• Resistant to water, oils, and chemicals

• Excellent surface detail

2. PA 12 GB (Glass Bead-Filled Nylon 12)

This variation of PA 12 is reinforced with glass beads to enhance stiffness and dimensional stability. It is well-suited for applications that require rigid components or structural integrity under load.

Key properties:

• Increased rigidity and dimensional stability

• Lower shrinkage and warping

• Ideal for enclosures, housings, and structural parts

3. PA 11 (Nylon 11)

PA 11 is a bio-based material known for its higher ductility and impact resistance compared to PA 12. It’s particularly useful for parts that need to flex without breaking, such as hinges or snap-fit components.

Key properties:

• High elongation at break

• Strong impact resistance

• Ideal for living hinges and flexible parts

• Derived from renewable resources (castor oil)

4. TPU (Thermoplastic Polyurethane)

TPU is used in MJF for applications that require elasticity and abrasion resistance. It’s excellent for flexible, rubber-like parts such as seals, gaskets, or protective covers.

Key properties:

• High flexibility and elasticity

• Durable and abrasion-resistant

• Suitable for cushioning and impact absorption

5. PP (Polypropylene)

Polypropylene is valued for its chemical resistance and low moisture absorption. It is an ideal choice for producing fluid systems, automotive parts, or medical components.

Key properties:

• Chemical and moisture resistance

• Weldable and reusable

• Suitable for lightweight, complex assemblies

Conclusion

MJF 3D printing supports a range of high-performance materials, each chosen for their strength, flexibility, chemical resistance, or surface quality. Whether you're prototyping functional parts or manufacturing end-use components, selecting the right material ensures that your product meets performance and durability standards across a wide range of industries.