Introduction
HP Multi Jet Fusion (MJF) technology has revolutionized 3D printing, offering unparalleled precision and quality. However, to fully leverage its capabilities, understanding specific design practices is essential. This guide provides insights into achieving maximum accuracy and optimal aesthetics in MJF 3D printing.
Achieving Dimensional Accuracy:
MJF technology can attain accuracy values of IT Grade 13, comparable to plastic injection molding. This precision is critical in industries where exact dimensions are paramount, such as aerospace and medical devices.
Embossed and Engraved Details:
MJF allows for high-resolution embossed and engraved details. For optimal results, ensure that any text, number, or drawing included in a part has a depth or height of at least 1 mm. This level of detail is crucial for parts that require clear, legible markings or intricate designs.
3D Print Accuracy Guidelines:
- Feature Placement: Place small features with critical dimensions, like pins, holes, and raised texts, in the same plane to ensure uniformity and precision.
- Cross-Section Transition: Design parts with smooth transitions between different cross-sections to avoid stress concentrations and improve structural integrity.
- Lightweight Designs: Consider hollowing parts or adding internal lattices to reduce weight without compromising strength.
- Aspect Ratio Management: Avoid designing long, thin, flat parts with an aspect ratio higher than 10:1 to prevent warping and ensure stability.
- Curved Segment Considerations: Avoid predominantly long and thin curved segments in your design, as they may pose challenges in printing and structural stability.
- Flat Area Design: Avoid ridges and ribs on large flat areas, as they can lead to uneven surfaces and potential print failures.
Design for Aesthetics and Surface Finish:
- Layer Lines Visibility: MJF uses 80 µm layers, which are typically not visible to the naked eye. To minimize the stair-stepping effect, keep angles above 20° between large flat areas and the XY plane.
- Orientation for Optimal Appearance: Surfaces facing downward typically have a better appearance, provided they avoid angles less than 5° to 10°.
- Experimentation for Best Results: Due to varying applications, experimenting with different orientations and angles is recommended to achieve the best look and feel.
Conclusion
Designing for HP Multi Jet Fusion requires a blend of technical understanding and creative problem-solving. By adhering to these guidelines, designers can create parts that not only meet stringent accuracy requirements but also exhibit superior aesthetic qualities. Embracing these best practices in MJF design will lead to successful, high-quality 3D printed parts suitable for a wide range of applications.
