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NATIONAL GEOGRAPHIC LEARNING

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Unit 7

Just Press "Print"

3D Printing is Changing the World

Lead-in 01

What's the most incredible thing you've ever wished you could just 'print out'? 🖨️

Imagine printing rocket parts, human organs, or a new nose for a baby. 3D printing sounds like science fiction — but it's already changing manufacturing, medicine, and architecture.

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Manufacturing

From jet parts to houses

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Medicine

Organs & bones

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Architecture

Printed buildings

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Food

Even chocolate!

Let's explore how a technology invented in the 1980s is becoming one of the most transformative forces of the 21st century.

Reading 02

Skimming Task ⏱️

Read the article quickly (90 seconds). Answer three questions:

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WHO?

Who is using 3D printing and leading research?

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WHAT?

What can 3D printers create and how?

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HOW/WHY?

Why is 3D printing better than traditional methods?

✅ WHO: General Electric, Airbus, Harvard researchers, DUS architectural firm  |  WHAT: 3D printers create solid objects layer by layer from digital designs  |  HOW/WHY: More flexible, less wasteful than traditional manufacturing; medical breakthroughs possible
Section One
Introduction
From science fiction to factory floors — 3D printing is already here.
Reading 03
Imagination Opening
Imagine being able to print rocket engine parts, chocolate figurines, designer sunglasses, or even pizzas — just by pressing a single button. It may sound like something out of science fiction, but it's increasingly becoming a reality. Thanks to 3D printing, companies are reimagining their long-term business plans. General Electric is already using 3D printers to make some parts of jet engines. Airbus envisions that by 2050, entire planes could be built out of 3D printed parts. And this trend isn't just limited to corporate giants. Dutch architectural firm DUS is 3D printing a house on the banks of Amsterdam's Buiksloter Canal.
'Imagine' invites the reader into a personal thought experiment, creating immediate engagement. It is a direct address that makes abstract technology feel personally relevant. This is a common journalistic opening technique — draw the reader in by asking them to picture something.
Reading 04
Science Fiction to Reality
Imagine being able to print rocket engine parts, chocolate figurines, designer sunglasses, or even pizzas — just by pressing a single button. It may sound like something out of science fiction, but it's increasingly becoming a reality. Thanks to 3D printing, companies are reimagining their long-term business plans. General Electric is already using 3D printers to make some parts of jet engines. Airbus envisions that by 2050, entire planes could be built out of 3D printed parts. And this trend isn't just limited to corporate giants. Dutch architectural firm DUS is 3D printing a house on the banks of Amsterdam's Buiksloter Canal.
Classic 'X but Y' contrast: expectation (science fiction) vs. reality. 'Increasingly' signals gradual progression — the reality is developing, not yet complete. This hedges the claim: not 'it IS reality' but 'it's becoming reality.' The word creates a sense of momentum and ongoing transformation.
Reading 05
Corporate Adoption
Imagine being able to print rocket engine parts, chocolate figurines, designer sunglasses, or even pizzas — just by pressing a single button. It may sound like something out of science fiction, but it's increasingly becoming a reality. Thanks to 3D printing, companies are reimagining their long-term business plans. General Electric is already using 3D printers to make some parts of jet engines. Airbus envisions that by 2050, entire planes could be built out of 3D printed parts. And this trend isn't just limited to corporate giants. Dutch architectural firm DUS is 3D printing a house on the banks of Amsterdam's Buiksloter Canal.
'Reimagining' (not just 'adjusting' or 'changing') implies a fundamental rethinking of strategy. It suggests that 3D printing doesn't just improve existing processes — it requires companies to reconsider their entire business model. The word connotes creative disruption at the deepest level.
Section Two
The Advantages of 3D Printing
Flexible, customizable, and waste-free manufacturing.
Reading 06
What is 3D Printing?
Invented in the mid-1980s, 3D printers create solid, three-dimensional objects from various materials such as plastic, wax, wood, gold, or titanium. A major advantage of 3D printing is that designs for objects can be easily customized or changed. When designs change in traditional manufacturing, the machinery needs to be redesigned or upgraded, which can be very costly. But in the case of 3D printers, only the software needs to be modified. 3D printing is also better than traditional manufacturing because there's no wasted material. With traditional manufacturing, material is cut away to create an object, but 3D printing uses only what is necessary. Guided by software, a 3D printer builds an object one layer at a time, placing material only where it needs to be. As a result, it can make complex objects less expensively.
Full form: 'Which was invented in the mid-1980s, 3D printers...' The reduced participial phrase is more concise and flows better as a sentence opener. It also frontloads historical context before the definition, giving the reader a sense of how long this technology has existed.
Reading 07
Flexible Design
Invented in the mid-1980s, 3D printers create solid, three-dimensional objects from various materials such as plastic, wax, wood, gold, or titanium. A major advantage of 3D printing is that designs for objects can be easily customized or changed. When designs change in traditional manufacturing, the machinery needs to be redesigned or upgraded, which can be very costly. But in the case of 3D printers, only the software needs to be modified. 3D printing is also better than traditional manufacturing because there's no wasted material. With traditional manufacturing, material is cut away to create an object, but 3D printing uses only what is necessary. Guided by software, a 3D printer builds an object one layer at a time, placing material only where it needs to be. As a result, it can make complex objects less expensively.
'Only' restricts the claim to software — nothing else needs changing. This creates an implicit comparison: traditional manufacturing requires expensive physical retooling, but 3D printing requires just a software change. 'Only' makes the advantage feel simple and dramatic by contrast.
Reading 08
Zero Waste
Invented in the mid-1980s, 3D printers create solid, three-dimensional objects from various materials such as plastic, wax, wood, gold, or titanium. A major advantage of 3D printing is that designs for objects can be easily customized or changed. When designs change in traditional manufacturing, the machinery needs to be redesigned or upgraded, which can be very costly. But in the case of 3D printers, only the software needs to be modified. 3D printing is also better than traditional manufacturing because there's no wasted material. With traditional manufacturing, material is cut away to create an object, but 3D printing uses only what is necessary. Guided by software, a 3D printer builds an object one layer at a time, placing material only where it needs to be. As a result, it can make complex objects less expensively.
Traditional = subtractive (remove material); 3D printing = additive (add only what's needed). The contrast highlights 3D printing's environmental advantage: zero waste. 'Only what is necessary' is a principle of efficiency. The implied argument: traditional manufacturing is inherently wasteful; 3D printing is inherently lean.
Reading 09
Cost Advantage
Invented in the mid-1980s, 3D printers create solid, three-dimensional objects from various materials such as plastic, wax, wood, gold, or titanium. A major advantage of 3D printing is that designs for objects can be easily customized or changed. When designs change in traditional manufacturing, the machinery needs to be redesigned or upgraded, which can be very costly. But in the case of 3D printers, only the software needs to be modified. 3D printing is also better than traditional manufacturing because there's no wasted material. With traditional manufacturing, material is cut away to create an object, but 3D printing uses only what is necessary. Guided by software, a 3D printer builds an object one layer at a time, placing material only where it needs to be. As a result, it can make complex objects less expensively.
'As a result' signals a causal consequence of the arguments in S2–S3: because designs are flexible (S2) AND there's no waste (S3), the outcome is lower cost (S4). This is a three-step argument: flexibility + no waste = cheaper. 'As a result' shows the logical chain is complete.
Section Three
Medical Uses of 3D Printing
Printing bones, organs, and saving young lives.
Reading 10
Precision Enables Novelty
This precision is making it possible to produce things that have never been made before. A team of Harvard University researchers recently printed human tissue, complete with blood vessels — a crucial step toward one day transplanting human organs printed from a patient's own cells. "That's the ultimate goal of 3D bio-printing," says Jennifer Lewis, who led the research. "We are many years away from achieving this goal." 3D printers can create bones, organs, synthetic skin, and prosthetic body parts — such as hands and arms. In fact, 3D printing saved a dying baby named Kaiba Gionfriddo, who was born with a condition that regularly caused the airways near his lungs to collapse. Using a 3D printer, a team of researchers printed a flexible tube, which they implanted in Kaiba, and which enabled him to breathe on his own. 3D printing also provided a nose for an Irish baby, Tessa Evans, who was born without one. Over time, 3D printed implants of increasing sizes will be surgically placed under her skin where her nose should be. The implants will gradually create a "nose" from her own skin, allowing her to look just like everyone else as she grows into adulthood.
The absolute 'never been made before' is a strong rhetorical claim — it implies historical uniqueness. It is justified because printing human tissue with functional blood vessels (S2) genuinely has no prior manufacturing equivalent. The phrase positions 3D printing as a paradigm shift, not merely an improvement.
Reading 11
Printing Human Tissue
This precision is making it possible to produce things that have never been made before. A team of Harvard University researchers recently printed human tissue, complete with blood vessels — a crucial step toward one day transplanting human organs printed from a patient's own cells. "That's the ultimate goal of 3D bio-printing," says Jennifer Lewis, who led the research. "We are many years away from achieving this goal." 3D printers can create bones, organs, synthetic skin, and prosthetic body parts — such as hands and arms. In fact, 3D printing saved a dying baby named Kaiba Gionfriddo, who was born with a condition that regularly caused the airways near his lungs to collapse. Using a 3D printer, a team of researchers printed a flexible tube, which they implanted in Kaiba, and which enabled him to breathe on his own. 3D printing also provided a nose for an Irish baby, Tessa Evans, who was born without one. Over time, 3D printed implants of increasing sizes will be surgically placed under her skin where her nose should be. The implants will gradually create a "nose" from her own skin, allowing her to look just like everyone else as she grows into adulthood.
'Step toward' = progress in the right direction, but not yet arrived. The phrase maintains scientific honesty: this is not 'we can now transplant printed organs' but 'we are closer.' Lewis's quote reinforces this: 'we are many years away.' The careful hedging prevents overclaiming while still conveying the excitement of the breakthrough.
Reading 12
Prosthetic Parts
This precision is making it possible to produce things that have never been made before. A team of Harvard University researchers recently printed human tissue, complete with blood vessels — a crucial step toward one day transplanting human organs printed from a patient's own cells. "That's the ultimate goal of 3D bio-printing," says Jennifer Lewis, who led the research. "We are many years away from achieving this goal." 3D printers can create bones, organs, synthetic skin, and prosthetic body parts — such as hands and arms. In fact, 3D printing saved a dying baby named Kaiba Gionfriddo, who was born with a condition that regularly caused the airways near his lungs to collapse. Using a 3D printer, a team of researchers printed a flexible tube, which they implanted in Kaiba, and which enabled him to breathe on his own. 3D printing also provided a nose for an Irish baby, Tessa Evans, who was born without one. Over time, 3D printed implants of increasing sizes will be surgically placed under her skin where her nose should be. The implants will gradually create a "nose" from her own skin, allowing her to look just like everyone else as she grows into adulthood.
Hands and arms are the most symbolically potent prosthetics — they enable work, gesture, touch, and self-expression. Choosing them makes the list feel human and emotionally resonant, not just technical. The dash + examples structure grounds the abstract list (bones, organs) in concrete, relatable body parts.
Reading 13
Baby Kaiba's Story
This precision is making it possible to produce things that have never been made before. A team of Harvard University researchers recently printed human tissue, complete with blood vessels — a crucial step toward one day transplanting human organs printed from a patient's own cells. "That's the ultimate goal of 3D bio-printing," says Jennifer Lewis, who led the research. "We are many years away from achieving this goal." 3D printers can create bones, organs, synthetic skin, and prosthetic body parts — such as hands and arms. In fact, 3D printing saved a dying baby named Kaiba Gionfriddo, who was born with a condition that regularly caused the airways near his lungs to collapse. Using a 3D printer, a team of researchers printed a flexible tube, which they implanted in Kaiba, and which enabled him to breathe on his own. 3D printing also provided a nose for an Irish baby, Tessa Evans, who was born without one. Over time, 3D printed implants of increasing sizes will be surgically placed under her skin where her nose should be. The implants will gradually create a "nose" from her own skin, allowing her to look just like everyone else as she grows into adulthood.
The shift to narrative (specific name, specific condition, specific outcome) is a classic journalistic technique called a 'human interest angle.' Abstract technology arguments are compelling logically; stories about individual babies are compelling emotionally. Combining both maximizes persuasion: the reader's intellect AND heart are engaged.
Reading 14
Tessa's Nose
This precision is making it possible to produce things that have never been made before. A team of Harvard University researchers recently printed human tissue, complete with blood vessels — a crucial step toward one day transplanting human organs printed from a patient's own cells. "That's the ultimate goal of 3D bio-printing," says Jennifer Lewis, who led the research. "We are many years away from achieving this goal." 3D printers can create bones, organs, synthetic skin, and prosthetic body parts — such as hands and arms. In fact, 3D printing saved a dying baby named Kaiba Gionfriddo, who was born with a condition that regularly caused the airways near his lungs to collapse. Using a 3D printer, a team of researchers printed a flexible tube, which they implanted in Kaiba, and which enabled him to breathe on his own. 3D printing also provided a nose for an Irish baby, Tessa Evans, who was born without one. Over time, 3D printed implants of increasing sizes will be surgically placed under her skin where her nose should be. The implants will gradually create a "nose" from her own skin, allowing her to look just like everyone else as she grows into adulthood.
The phrase appeals to universal human desires: belonging, normalcy, and dignity. 'Just like everyone else' is not a scientific claim but a social one — it argues that 3D printing restores social inclusion for those born different. This elevates the technology from impressive to deeply humane.
Section Four
The Future of 3D Printing
Software is the final frontier — then medicine transforms.
Reading 15
'Clearly' as Signal
Clearly, 3D printing has much potential for growth. While there is no doubt that this medical technology will continue to improve many people's lives, the challenge lies in developing software that is advanced or sophisticated enough to create the initial blueprints. Designing the blueprint or a digital model for a vital organ — with all its cell types and structures — is an extremely complex process. Nevertheless, many are hopeful that this obstacle will soon be overcome, and that 3D printing will change the face of medicine.
'Clearly' is an evidential adverb signaling that the following claim follows logically from what has been presented. It is also slightly assertive — it implies: if you've been reading, this conclusion should be obvious. It functions as a transition into the conclusion phase: 'we have shown X; clearly, therefore Y follows.'
Reading 16
The Software Challenge
Clearly, 3D printing has much potential for growth. While there is no doubt that this medical technology will continue to improve many people's lives, the challenge lies in developing software that is advanced or sophisticated enough to create the initial blueprints. Designing the blueprint or a digital model for a vital organ — with all its cell types and structures — is an extremely complex process. Nevertheless, many are hopeful that this obstacle will soon be overcome, and that 3D printing will change the face of medicine.
Structure: concession (technology will improve lives, no doubt) + pivot (BUT the challenge is software). 'No doubt' is an absolute that grants the optimistic premise. 'The challenge lies in' focuses the concern precisely. This is the article's key tension: the technology works, but a software bottleneck limits it.
Reading 17
Hopeful Closing
Clearly, 3D printing has much potential for growth. While there is no doubt that this medical technology will continue to improve many people's lives, the challenge lies in developing software that is advanced or sophisticated enough to create the initial blueprints. Designing the blueprint or a digital model for a vital organ — with all its cell types and structures — is an extremely complex process. Nevertheless, many are hopeful that this obstacle will soon be overcome, and that 3D printing will change the face of medicine.
'Many' is deliberately vague — it includes researchers, doctors, patients, families. This broadens the emotional investment. The passive 'will be overcome' focuses on the event (obstacle disappearing) rather than the agents (who overcomes it). It creates a sense of collective, inevitable progress — as if the obstacle itself will yield, not just be conquered by specific actors.
Language 18

Language Point 1: Comparatives in Technical Writing

better than less expensively more flexible comparative adjectives
A) "3D printing is BETTER THAN traditional manufacturing because there's no wasted material"
"it can make complex objects LESS EXPENSIVELY" → comparative adverb

B) Comparative structures: more + adjective / adjective + -er / less + adjective
more flexible | cheaper | less wasteful | more sophisticated

C) ❌ "3D printing is more better than traditional methods."
→ double comparative error — never combine 'more' with a short -er form

D) RULE: Use simple comparatives (better/faster/cheaper) for common adjectives;
'more + adjective' for longer ones (more sophisticated).
Never combine 'more' with a short comparative (-er form).
Technical writing uses comparatives to evaluate options: which is faster, cheaper, more efficient? Getting comparatives right is essential for precision. 'Less expensively' (not 'less expensive') is correct because it modifies 'make' (verb), not a noun. Adjective vs. adverb distinction matters.
Language 19

Language Point 2: Passive Voice for Scientific Writing

was invented is being printed has been placed passive voice
A) "Invented in the mid-1980s, 3D printers create..." → reduced passive participial (backgrounding the inventor)
"A flexible tube WAS PRINTED... WHICH WAS IMPLANTED in Kaiba" → passive focuses on the object/patient

B) Why passive in science: focus on the process/result, not the person;
universality; formal register

C) ❌ "Scientists invented 3D printing in 1985." → active puts scientists in focus
✅ "3D printing was invented in the mid-1980s." → passive backgrounds inventors, foregrounds technology

D) RULE: Use passive when the agent is unknown, irrelevant, or you want to
foreground the process/result rather than the actor.
The Kaiba story uses passive brilliantly: "a flexible tube was printed... was implanted... enabled him to breathe." The focus stays on what happened TO Kaiba and what each object DID — not on which researcher did what. This makes the medical drama more emotionally immediate.
Language 20

Language Point 3: Infinitive and Gerund After Verbs

make it possible to enable to try to involves -ing
A) "making it POSSIBLE TO produce" → adjective + infinitive
"it can make complex objects less expensively" → verb + object + adjective (no infinitive)

B) After 'avoid', 'involve', 'consider', 'imagine' → gerund (-ing)
After 'aim', 'attempt', 'want', 'enable', 'allow' → infinitive (to + V)

C) ❌ "Imagine to print rocket parts" → WRONG: 'imagine' takes gerund
✅ "Imagine printing rocket parts" → correct gerund after 'imagine'

D) RULE: Some verbs take gerunds, some take infinitives.
'Imagine', 'avoid', 'consider' take -ing.
'Want', 'enable', 'allow', 'attempt' take infinitive.
The article's opening: "Imagine BEING ABLE TO PRINT" uses both correctly — 'imagine' takes gerund ('being able'), while 'able to' takes infinitive ('to print'). These verb patterns are fixed in English — no rule explains WHY, only memory and practice establish them.
🖨️

Lesson Complete

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Manufacturing

Flexible, zero-waste production

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Medicine

Bones, organs, and saving babies

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The Future

Software is the final frontier

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Impact

Changing face of medicine

We are many years away from achieving this goal — but every layer brings us closer.