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Did You Know Additively Manufactured Parts with HP MJF Can Be Painted?

Introduction to Additively Manufactured Parts with HP MJF:

Additive Manufacturing, also known as 3D printing, has revolutionised the manufacturing industry by allowing the production of complex and customised parts with ease. One of the prominent technologies in additive manufacturing is HP Multi Jet Fusion (MJF), which offers exceptional speed, accuracy, and cost effectiveness. While additive manufacturing is commonly associated with creating parts in their final form, it is often overlooked that these parts can also be painted to enhance their aesthetics or meet specific requirements. In this article, we will explore the fascinating world of painting parts additively manufactured parts with HP MJF.

Benefits of Additively Manufactured Parts with HP MJF:

1. Cost Effectiveness and Time Saving and Advantages

Additively manufactured parts with HP MJF offers significant cost savings compared to traditional manufacturing methods. By eliminating the need for complex tooling and reducing material waste, HP MJF enables efficient production at a lower cost per part. Additionally, the high printing speed of HP MJF technology translates into reduced lead times, allowing manufacturers to bring their products to market faster.

2. Design Flexibility and Customisation Options

HP MJF empowers designers and engineers with unparalleled design freedom. Technology enables creation of intricate geometries, internal features, and lightweight structures that are challenging or impossible to achieve with traditional manufacturing processes. With HP MJF, parts can be easily customised and tailored to specific requirements, providing opportunities for product differentiation and personalisation.

3. Enhanced Production Efficiency and Reduced Waste

The MJF process is highly efficient, as it allows for the simultaneous printing of multiple parts within a single build volume. This batch production capability maximises machine utilisation and minimises production time. Additionally, the ability to optimise part designs and consolidate multiple components into a single printed part reduces material waste and assembly requirements, leading to a more sustainable manufacturing process.



Compatibility of HP MJF Parts with Printing:

1. Overview of the Materials Used in HP MJF and Their Paintability

HP MJF technology utilises thermoplastics materials, such as nylon based powders, to produce parts. These materials exhibits excellence paintability due to their compatibility with various paint types. Commonly used materials in HP MJF, such as PA12 (Polyamide 12), have proven to be receptive to paints and coatings, allowing for versatile post processing options.

2. Surface Preparation Techniques for Painting HP MJF Parts

To ensure optimal paint adhesion, proper surface preparation is crucial. HP MJF parts should be cleaned thoroughly to remove any residual powder or containments. Techniques such as sanding or bead blasting can be employed to enhance the surface texture, promoting better paint adhesion. It is important to follow the manufacturer’s guidelines for specific surface preparation recommendations.

3. Adhesion Considerations for Achieving Durable Paint Finishes

Achieving durable paint finishes on HP MJF parts require careful consideration of adhesion factors. Selecting suitable primers and paints that bond well with the material is essential. Additionally, understanding the thermal properties of the MJF material is crucial, as it can impact the paint curing process. Adhering to proper curing and drying times ensures long lasting paint adhesion and durability.

Steps to Paints HP MJF Parts:

1. Cleaning and Prepping the Part’s Surface

Before painting, it is important to clean the HP MJF part thoroughly to remove any dust, oils, or residues. Use a mild detergent or solvent recommended by the material manufacturer to avoid damaging the part. Ensure that the surface is completely dry before proceeding with painting process.

2. Applying A Primer for Improved Adhesion

Applying  a primer layer to the surface of the additively manufactured parts with HP MJF enhances paint adhesion and durability. Choose a primer that is compatible with the MJF material and the type of paint you plan to use. Apply the primer evenly, following the manufacturer’s instructions, and allow it to dry completely before proceeding with the paint application.

3. Selecting Suitable Paints and Finishes for HP MJF Parts

When selecting paints for HP MJF parts, consider factors such as compatibility with the material, desired finish (matte, glossy, etc.), and intended application. Acrylic or polyurethane-based paints are commonly used due to their excellent adhesion and flexibility. Additionally, consider using paints specifically formulated for 3D printed parts to ensure optimal results.

4. Techniques for Achieving Smooth and Even Paint Application

To achieve a smooth and even paint application, use techniques such as air brushing, spray painting, or brush painting. Apply thin layers of paint, allowing each layer to dry before applying the next. This helps prevent drips, runs or uneven coverage. Take care to maintain a consistent distance and angle while painting to ensure uniformity.

Considerations for Successful Painting:

1. Understanding the Limitations and Constraints of HP MJF Parts

While additively manufactured parts with HP MJF can be painted, it is important to be aware of their limitations. Complex geometries, fine details, or internal features may require careful masking or specialised painting techniques. Consider the structural integrity of the part and ensure that the painting process does not compromise its functionality or strength.

2. Importance of Proper Curing Drying Times

Proper curing and drying times are crucial for achieving durable paint finishes. Follow the paint manufacturer’s recommendations regarding curing time, temperature, and humidity conditions. Rushing the drying process may result in paint defects or compromised adhesion. Allow sufficient time for the paint to cure fully before subjecting the part to additional handling or assembly.

3. Avoiding Overpainting and Excessive Layers

Applying excessive layers of paint can lead to a loss of fine details or obscuring of surface textures. It is important to strike a balance between achieving the desired coverage and maintaining the integrity of the printed part. Practice restraint while applying paint and consider testing on a scrap piece or a less visible area before proceeding with the final part.

Tips for Achieving High Quality Painted HP MJF Parts:

1. Using Compatible Paints and Primers Recommended By the Manfacturer

Follow the recommendations provided by the HP MJF material manufacturer and the paint manufacturer. Ensure that the paints and primers you use are compatible with the specific MJF material you are working with. Using recommended products helps ensure optimal adhesion, color vibrancy, and longevity of the painted finish.

2. Implementing Proper Masking Technique for Precise Paint Application

When painting HP MJF parts with intricate or delicate features, consider using masking techniques to protect specific areas from paint overspray or unintended paint application. Use masking tapes, stencils, or liquid masking agents to cover the desired areas and achieve precise paint application. Take care when removing masking mateials to avoid damaging the painted surface.

3. Applying Clear Coats for Protection and Improved Aesthetics

Applying a clear coat over the painted surface can provide an extra layer of protection, enhance the glossiness of the finish, and improve the overall appearance. Clear coats are available in various finishes, such as matte, satin or glossy. Choose a clear coat that complements the desired aesthetics and follow the manufacturer’s instructions for proper application.


In conclusion, the ability to paint parts additively manufactured parts with HP MJF technology opens up new possibilities for creativity, customisation, and aesthetics. By understanding the materials used in HP MJF, surface preparation techniques, and the importance of proper paint selection and application, manufacturers can achieve high quality painted finishes on their 3D printed parts. With the numerous benefits offered by HP MJF, such as cost effectiveness, design flexibility, and production efficiency, combined with the ability to paint these parts, additive manufacturing continues to push the boundariesof innovation in the manufacturing industry. Embrace the potential of painting additively manufactured parts with HP MJF and unlock endless possibilities for your next manufacturing project.


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