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Design Guidelines

How to Design for HP Multi Jet Fusion

With HP's Multi Jet Fusion technology, the printing processes and quality of materials allows for exceptional freedom of design and level of detail, especially compared to traditional manufacturing processes.

 

As with all 3D printing technologies, there is a set of recommendations to follow when designing for HP Multi Jet Fusion technology to ensure parts and features are printed to specification, as well as to leverage the full potential of the advanced printing processes. 

Tolerances 

Expect a dimensional accuracy of +/- 0.3% (with a lower limit of +/- 0.3%)

Bounding Box 

This represents the largest model we can manufacture in one piece. As with injection molding, a larger part can be digitally cut and printed in smaller parts, which can be re-connected after printing.

Maximum

284 x 380 x 380 mm

Minimum

x + y + z greater than 9 mm

 
Wall Thickness

Walls that do not meet the minimum measurements risk damage in the cleaning and printing process. They are also prone to warping during printing.

Min. supported wall thickness

0.4 mm

Min. unsupported wall thickness

0.5 mm

Wires 

"Wires" are sections that are long and narrow. Supported wires are connected at 2 ends. Unsupported wires are connected at only one end.

Min. supported wires

0.4 mm

Min. unsupported wires

0.9 mm

Surface Detail

Min. embossed detail

0.2 mm high & wide

for readable text - 0.5 mm wide, 0.3 mm high

Min. debossed detail

0.2 mm high & wide

 for readable text - 0.4 mm high & wide

Escape Holes

Because Multi-Jet Fusion uses layers of powder to build parts, excess powder can be trapped in hollow models. The powder can be left in the hollow piece, or "escape holes" can be added so pressurized air can be used to blast out excess powder.

Diameter of single escape hole

4.0 mm

Diameter of 2+ escape holes

2.0 mm

Clearance

Clearance is the space between parts that are built in place, such as in a ball-and-socket joint or hinge.

Minimum clearance

0.6 mm

Sprues

Sprues are wires that join multiple parts. To minimize the risk of breaking during the cleaning process they should be thicker than the minimum wire thickness.

Sprue minimum thickness​

2.0 mm 

Explore HP's Multi Jet Fusion design guides to get the most out of printing with MJF technology
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Best Practices

What you need to know to ensure parts and features are printed to specification. 

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Interlocking Parts

Design inspiration for interlocking parts, such as chains and chain mail.

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Design for Accuracy

Learn how to avoid issues with parts and achieve maximum accuracy.

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Hinge Design

Learn more about various types and designs of hinges that are possible with MJF technology.

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Design for Aesthetics

Discover how to print parts for optimal appearance.

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Design for Cleaning

Learn how to facilitate the cleaning process and minimize cost once the part is printed.

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