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The world’s largest 3D printer is at a university in Maine. It just unveiled an even bigger one

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The world’s largest 3D printer is at a university in Maine. It just unveiled an even bigger one


The inside of the University of Maine’s first 3D printed home is visible on Oct. 12, 2023, in Orono, Maine. The printer that created the house can cut construction time and labor. An even larger printer unveiled on Tuesday, April 23, 2024, may one day create entire neighborhoods. Credit: AP Photo/Kevin Bennett

The world’s largest 3D printer has created a house that can cut construction time and labor. An even larger printer unveiled on Tuesday may one day create entire neighborhoods.

The machine revealed Tuesday at the University of Maine is four times larger than the first one—commissioned less than five years ago—and capable of printing ever mightier objects. That includes scaling up its 3D-printed home technology using bio-based materials to eventually demonstrate how printed neighborhoods can offer an avenue to affordable housing to address homelessness in the region.

Thermoplastic polymers are extruded from a printer dubbed the “Factory of the Future 1.0.” There could be even larger printers after the University of Maine breaks ground this summer on a new building, a spokesperson said.

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The massive printer “opens up new research frontiers to integrate these collaborative robotics operations at a very large scale with new sensors, high-performance computing and artificial intelligence,” said Habib Dagher, director of UMaine’s Advanced Structures & Composite Center, where both of the printers are located.

Those attending the event included representatives from departments of defense, energy and housing, as well as other stakeholders who plan to utilize the new technologies made available by the printer. Heidi Shyu, under secretary of defense for research and engineering, said the printer “stands as a beacon of innovation.”

The world's largest 3D printer is at a university in Maine. It just unveiled an even bigger one
A bed sits inside the University of Maine’s first 3D printed home on Oct. 12, 2023, in Orono, Maine. The printer that created the house can cut construction time and labor. An even larger printer unveiled on Tuesday, April 23, 2024, may one day create entire neighborhoods. Credit: AP Photo/Kevin Bennett

The printer’s frame fills up the large building in which it’s housed on the UMaine campus, and can print objects 96 feet long by 32 feet wide by 18 feet high (29 meters by 10 meters by 5.5 meters).

It has a voracious appetite, consuming as much as 500 pounds (227 kilograms) of material per hour.

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The original printer, christened in 2019, was certified by Guinness World Records as the world’s largest polymer 3D printer, the university said. It was used to create a 600-square-foot, single-family home made of wood fiber and bio-resin materials that are recyclable. Dubbed “BioHome3D,” it showed an ability to quickly produce homes. To meet the growing demand for housing, Maine alone will need another 80,000 homes over the next six years, according to MaineHousing.

Dagher said there’s a shortage of both affordable housing and workers to build homes. The university wants to show how homes can be constructed nearly entirely by a printer with a lower carbon footprint. The buildings and construction sector accounts for roughly 37% of global greenhouse gas emissions, largely due to the production and use of materials such as cement, steel and aluminum that have a significant carbon footprint, according to the United Nations Environment Programme.

The world's largest 3D printer is at a university in Maine. It just unveiled an even bigger one
A cross section of an exterior wall of a house is being printed on a 3D printer at the University of Maine’s Advanced Structures & Composite Center on Oct. 12, 2023, in Orono, Maine. An even larger printer unveiled on Tuesday, April 23, 2024, may one day create entire neighborhoods. Credit: AP Photo/Kevin Bennett

Such printed buildings can be recycled, which is unique compared to current construction. “You can basically deconstruct it, you can grind it up if you wish, the 3D printed parts, and reprint with them, do it again,” Dagher said before the event.

“It’s not about building a cheap house or a biohome,” he added, referring to the first 3D-printed house made entirely with bio-based materials. “We wanted to build a house that people would say, ‘Wow, I really want to live there.’”

Looking ahead, researchers plan to tinker with the material consumed by the machine, including more bio-based feedstocks from wood residuals that are abundant in Maine, the nation’s most heavily forested state.

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But it can be used for a variety of other creations and already has been used for a range of things, from boats to defense department structures. In the past, the university showed off a 25-foot boat created by the first printer.

The world's largest 3D printer is at a university in Maine. It just unveiled an even bigger one
The University of Maine’s first 3D printed home sits on Oct. 12, 2023, in Orono, Maine. The printer that created the house can cut construction time and labor. An even larger printer unveiled on Tuesday, April 23, 2024, may one day create entire neighborhoods. Credit: AP Photo/Kevin Bennett

As for the original 3D printer, it isn’t going away. The two printers can be used in concert to streamline manufacturing by working on the same project—or even part if necessary—and there will be even more of them working together in the future, officials said.

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Maine Celtics edge Delaware Blue Coats in thrilling 113-111 victory

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Maine Celtics edge Delaware Blue Coats in thrilling 113-111 victory


The Maine Celtics returned to the Portland Expo for a two-game series against the Delaware Blue Coats. Both teams started strong, with Kendal Brown hitting a three-pointer to put the Celtics up by three. Igor Milicic responded with a long-range shot to tie the game for the Blue Coats. Celtics guard Max Shulga contributed significantly, scoring 17 points, including a crucial three-pointer. Ron Harper Jr. led the game with an impressive 46 points, but it wasn’t enough as the Celtics secured a narrow 113-111 win. The two teams will face off again Sunday afternoon at the Expo.



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Maine knows the cost of war. Our leaders must remember it too. | Opinion

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Maine knows the cost of war. Our leaders must remember it too. | Opinion


Morgan Lueck, a native of Sumner who now lives in China, Maine, served as a sergeant in the Marine Corps. He holds a Master of Science degree in counterterrorism and homeland security from American University.

As I reflect on this past Veterans Day, I am reminded of what military service demands and of what national decisions about war truly cost. It is about remembering the profound weight of what is asked when a nation chooses conflict.

The burden is not theoretical; it is carried by service members, their families and their communities for generations. Because of this, those we elect have a solemn obligation to exercise judgment before committing Americans to war.

That obligation is not being met.

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The recent U.S. maritime and aerial operations have included lethal strikes that United Nations experts describe as extrajudicial killings in international waters. The president has stated that he “does not need a declaration of war” to expand these operations.

The deployment of the USS Gerald R. Ford carrier strike group to the Caribbean signals an unjustified escalation, without clear objectives, legal grounding or an exit strategy. Senior lawmakers report they have not been given the required legal basis for these operations. 

Maine has a senator who chose to ignore that history.

Sen. Susan Collins serves on the Senate Select Committee on Intelligence. Her duty is to oversee covert military activity and ensure compliance with U.S. law. That role is not symbolic. It is the constitutional safeguard intended to prevent undeclared war.

Twice now, the Senate has considered bipartisan measures to require congressional authorization for further U.S. strikes in Venezuela. Twice Sen. Susan Collins has voted to block those measures. Most recently, the measure failed 51–49, and hers was the decisive vote. 

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Her vote preserved the administration’s ability to conduct lethal operations without congressional approval. And it confirms what Mainers who serve in uniform have long known: her self-styled reputation for moderation does not extend to upholding constitutional checks on war power. 

This was not an isolated misjudgment. It was the continuation of a pattern.

Collins has built her reputation on careful deliberation. This was careless. It is an abdication of the oversight she is uniquely positioned to exercise and was entrusted with by her constituents. Collins did not defend constitutional war powers or demand transparency on their behalf. She chose the path of least resistance and opposed the guardrails. She claimed the restrictions were “too broad.” We have seen this pattern from her before.

When she voted to authorize the war in Iraq, she did so under the same framework she invokes now: deference to executive assurances, an avoidance of hard constraints and a disregard for the human cost of what those decisions set in motion.

Maine remembers that cost. We remember it in the names etched into stone on town memorials, in flag-lined funeral routes through our smallest towns, in the quiet corners of our lives where someone’s absence is still felt. The Iraq War reshaped families and communities here at home. The lesson should have been clear: war must not be entered quietly, casually or without clarity. Yet the pattern is repeating. Only the geography has changed.

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Those of us who have served are not “anti-intervention.” We are against unexamined intervention. We are against wars entered casually and exited slowly. We are against repeating the pattern that has taken so much from so many for so little strategic return. 

Make no mistake, Nicolás Maduro is a dictator, and Venezuela’s alignment with Russia, China and Iran is strategically concerning. But recognizing a threat is not the same as authorizing a war.

If the United States is to use military force, the administration must explain the rationale, Congress must debate and approve it and the mission must have clear goals and limits, including a plan to end the conflict before it begins.

If Americans are going to be asked to risk their lives, then those we elect to vote on our behalf have a duty to stand up, speak clearly and take responsibility. That duty is not being met. And once again, Sen. Collins is choosing caution over courage, and silence over leadership, at the very moment when bravery and clarity are required.

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Video Professor missing on Maine island as community continues search

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Video Professor missing on Maine island as community continues search


Professor missing on Maine island as community continues search

Wiley Davi, an English and media studies professor at Bentley University in Waltham, Massachusetts, was last seen on Nov. 15 on Maine’s Peaks Island, the Maine Warden Service said in a statement.

November 20, 2025



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