science

Multi-jet fusion

Multi-jet fusion is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Multi-jet fusion rather than just read about it. In short: Multi-jet fusion (MJF) is a type of 3D printing technology developed by Hewlett-Packard (HP). It works by depositing powder in layers, spraying it with a fusing and detailing agent, and then bonding it together with heat for each layer pass.

Key takeaways

Multi-jet fusion belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Multi-jet fusion to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Multi-jet fusion from memory before moving on to harder problems.

Reference excerpt

Multi-jet fusion (MJF) is a type of 3D printing technology developed by Hewlett-Packard (HP). It works by depositing powder in layers, spraying it with a fusing and detailing agent, and then bonding it together with heat for each layer pass. Similar to other types of 3D printing, the technology is particularly suitable for prototyping in product development, small-scale production, or parts that need to be customized. MJF is marketed as having strength comparable to injection molding. The most common material in MJF is nylon (PA12 and PA11), but the technology can be used with many other thermoplastic materials, including elastomers ("rubber materials") and fibre-reinforced composites. The technology is claimed to be more cost-effective at large scale compared to other types of 3D printing.

History In 2013, HP announced that it would enter the 3D printing market in 2014. In 2016, it introduced Multi Jet Fusion. In 2021, it was claimed that HP held around 100 patents related to MJF technology.

Operation The printer distributes a powder (usually nylon) in thin layers over a build surface, and between each layer, two types of liquids, namely a fusing agent and a detailing agent, are sprayed onto the newly applied layer of powder using an inkjet. After the liquids are applied, a heat source (often infrared light) passes over the layer, which bonds the powder particles together into a solid layer. The next layer of powder is then applied on top of the previous one, and the process is repeated without the need for additional support structures since the surrounding powder provides the necessary support. Finally, the parts must be cooled and cleaned of excess powder. The result is claimed to often have better surface quality straight from the printer compared to fused filament fabrication (FFF).

See also Fused filament fabrication (FFF), printing technology based on melting of thermoplastics Selective laser sintering (SLS), printing technology based on melting metal powder with a laser Stereolithography, printing technology based on photopolymerizable resin Powder bed fusion

References

Worked examples

Example 1 — a first encounter with Multi-jet fusion

Start with the simplest possible case. Write down what Multi-jet fusion claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Multi-jet fusion before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Multi-jet fusion ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Multi-jet fusion

In research: Multi-jet fusion appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Multi-jet fusion in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Multi-jet fusion is common in secondary-school and first-year university syllabi. It links to neighbouring topics 3D printing, so understanding it makes those chapters shorter.
In everyday life: Look for Multi-jet fusion outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Multi-jet fusion in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Multi-jet fusion means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Multi-jet fusion out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Multi-jet fusion in simple terms?

Why does Multi-jet fusion matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Multi-jet fusion?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Multi-jet fusion.