Multi Jet Fusion (MJF) is widely known for its ability to deliver high-speed, high-quality 3D prints, making it a preferred solution for both prototyping and short-run production. One of the key advantages of MJF 3D printing is its relatively fast build time compared to other additive manufacturing technologies. However, the exact build time can vary depending on several factors.
Average Build Time
The typical build time for MJF prints ranges from 10 to 20 hours per full build. This duration includes the time it takes to print all layers of the selected parts in the build volume. In general, an individual part can be printed in just a few hours if it’s small and the machine isn’t fully loaded. However, full builds that maximize the printer’s capacity can take closer to 18–20 hours.
Key Factors That Affect Build Time
1. Part Height:
MJF prints all parts layer by layer from the bottom up, so the tallest object in the build determines the total height and significantly impacts build time. Even if other parts are shorter, the printer must complete all layers up to the tallest part.
2. Part Packing and Layout:
Efficient use of the build chamber can reduce total printing time per part. Proper packing of parts can allow more items to be printed in a single run, optimizing the time per unit.
3. Layer Thickness:
Standard MJF layer thickness is around 80 microns (0.08 mm). This fine resolution ensures excellent detail and surface quality but requires many layers, especially for tall parts, which adds to the overall time.
4. Material Used:
While most MJF printers use PA 12 or PA 11, different materials can have slight variations in heating and fusing time. However, these differences are generally minimal in terms of build time.
5. Machine Model and Settings:
HP’s MJF printers come in different models, such as the Jet Fusion 5200 and 4200 series. Higher-end models typically have faster print capabilities and may include automation features that reduce manual setup and downtime between builds.
6. Post-Processing Time (Cooling):
After printing, the build must cool down inside the machine or in a separate cooling unit, which can add 4 to 12 hours depending on the build size. While not part of the active printing time, cooling is essential before parts can be unpacked and handled.
How to Optimize Build Time
To reduce MJF build time:
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Minimize part height where possible.
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Consolidate small parts into a single build.
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Design for efficient packing within the build volume.
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Work with an experienced service provider who can optimize scheduling and chamber usage.
Conclusion
The typical build time for MJF prints is highly efficient compared to other 3D printing methods, often falling between 10 to 20 hours for a full build. With the ability to produce high-quality parts quickly and consistently, MJF 3D printing is an excellent solution for companies that value both speed and performance. By understanding the factors that influence build time, designers and engineers can better plan their production schedules and get products to market faster.
