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How a 3D printer works

In 2018, printing a document or photo is as simple as hitting a button and the finished product arrives in seconds. But what happens when you add an extra dimension?

Over the last several years, 3D printing has exploded and you’ll find specialized machines at libraries, universities or even your local office supply store. Still, 3D printers haven’t matched the ubiquity of their 2D cousins and an ongoing debate over legalizing 3D printed guns is bringing the technology to a new audience.

Additive manufacturing — 3D printing by another name — was invented in the 1980s and today, there are a variety of different methods and classes of printers. With the right machinery, you can build an object with just about any material, from ceramic to copper to resin, though plastic is the most common, especially at the consumer level.

At the most basic level, it’s similar to regular printing, just imagine the machine pouring plastic in vertical layers instead of ink in horizontal lines.

“The whole idea of additive manufacturing is that you put things down a layer at a time,” said Edward Currie, associate professor of engineering at Hofstra University. “When you build a house, you put down the foundation and then you start putting up the bricks and the walls.”

Making a 3D model

Unlike a traditional 2D printer, 3D printers require special files known as blueprints that specify the dimensions for a 3D object.

A process called “slicing” follows the blueprint and divides 3D drawings into the layers that the printer will trace out.

“The technical knowledge side of it is coming up with the drawings. That’s where the real work is,” Currie said. “It’s like when you print a word document, you just hit print. What’s the hard part? It’s creating the document, same thing.”

There are three ways to get a computer assisted design file.

You can draw the object yourself, using CAD software to create a 3D digital model, or you can use someone else’s blueprints. You can also replicate an existing item by using a laser and scanning software to create a blueprint.

Waiting for results

To create the object, you just hit print. It’s as simple as it sounds. The rest of the work is for the printer to do, Currie said.

The printer works like an oversized glue gun, eating up spools of plastic filament.

“We start with material that’s pretty thick, and you pass it through a heated nozzle and you force it to come out,” Currie said. “Out the other side comes something thinner than a human hair.”

The printer’s computer sees the object as a series of points on a plane, according to Makerbot, one of the leading manufacturers of 3D printers.

The printer’s nozzle moves between these points, depositing plastic on a printer tray along the way.

The time required for printing depends on what the user is creating. A night vision goggle frame Currie designed took 56 hours.

The time required will depend on the size of the object, the desired quality of the finish and how solid it is — tighter infill patterns take longer than loose ones, a smoother finish takes longer than a rough one.

All done

The final result may be a solid object or parts that need to be put together.

The quality of printers varies significantly, which is an important consideration, Currie said.

3D printers are available for as little as a few hundred dollars and as much as hundreds of thousands. If exact dimensions are important to you — such as if you’re printing several objects that need to fit together like a puzzle — you’ll need a machine that’s much more expensive. Cheaper printers also can’t produce as smooth of a finish.

On Thursday, printers in Currie’s lab hummed for several hours, slowly building the latest version of wound closure clips. Once finished, magnets are attached.

The clips can be attached to either side of an open wound and the magnets will hold the wound together. A whole set can be used to close a wound more precisely than traditional stitches.

And if anything is not quite right with the clip, Currie just starts over. Traditionally, he’d have to request a new piece from the machine shop, which could take days or weeks. That’s the beauty of 3D printing, he said.

Deciding what to print

It’s a useful tool for creating prototypes and building models, Currie said. Jay Leno famously uses a 3D printer to replicate unavailable parts for restored cars so the parts can be custom manufactured.

In Currie’s lab, they’ve created dozens if not hundreds of versions of magnetic clips that can be used to help close open wounds, and other objects.

But uses are limited. Not every item is suited to be made from plastic — it’s fine for a robotic arm gear or a toy, but not practical for items that need to withstand high pressure or temperature. For example, experts said 3D printed plastic guns — which prosecutors say are illegal in New York state — are only durable enough for one or a few shots depending on the model, before they fall apart.

Read more about 3D printed guns here.

MS-13 on Long Island: What we know about the gang TERST

Where does the gang originate?

MS-13’s home base is in El Salvador.

Experts say the violent culture of the gang comes out of the at-times lawlessness of the country, where police and the army and street gangs in poorer neighborhoods have waged fights for control with almost no holds barred.

When did they show up on Long Island and where have they spread?

For the most part, MS-13 gang members who come to the United States settle in areas where there are already Salvadoran communities — on Long Island in Brentwood, Central Islip, Huntington Station, Hempstead and Freeport.

The street gang has existed for decades, but the recent uptick in activity on Long Island has been linked by officials to the surge in immigrant teens who have come into the country as unaccompanied minors since 2015. Suffolk County ranks near the top in the nation for the number of children who cross the border illegally, according to recent statistics. The gang sees them as potential recruits.

Officials stressed that not all unaccompanied minors are gang members.

How many members are there on Long Island?

Authorities in Nassau County have identified close to 500 MS-13 members, 300 of whom are still active, police said.

Suffolk County currently has about 300 confirmed members of the gang, along with another 200 associates identified, police said.

How many have been charged with crimes?

The situation is fluid. In January, 17 MS-13 members were arraigned in Nassau County and charged in connection with crimes that ranged from murder and drug trafficking to conspiracy and weapons possession. Swept up in the 21-count indictment was Miguel Angel Corea Diaz, the man who Nassau County District Attorney Madeline Singas identified as the leader of East Coast operations for the gang.

Suffolk police have made 330 arrests of 220 individuals since the Brentwood murders of two teenage girls in September 2016, according to District Attorney Timothy Sini, the county’s police commissioner until early January.

How has the gang evolved?

Experts believe the recent eruption of gang violence on Long Island is due to a new and more deadly profile of MS-13. At the heart of that profile are newcomers from Central America eager to make their mark within an immigrant gang already known for its code of brutality and violence and its weapon of choice, the machete.

These newcomers have found a niche in MS-13 on Long Island — replacing those who have been arrested — and are focused on proving themselves to be even more violent than established gang members.

Experts say MS-13 members commit violence for its own sake, in large part as a way to carve out and control the turf they consider theirs, purging it of rival gang members and others perceived as having disrespected MS-13.

What is the profile of an MS-13 gang member?

Increasingly, new recruits to the gang are young.

The machete is their principal weapon, in part because of its savagery, but also because it is commonly available and used for agriculture in Central America, authorities say. It is cheaper to purchase both there and in the United States, where guns are harder to obtain and more expensive, several experts say.

How do they make money?

A member of MS-13 usually puts in an eight-hour day at a low-paying job, sources say — but then is required to go out at night and “put in work,” or hunt down perceived enemies.

Recently arrested members of the gang have been employed as restaurant workers, car washers, landscapers, salad makers and sheet-metal platers, sources said.

But the gang cannot survive without money, Homeland Security Special Agent in Charge Angel M. Melendez said. The gang has a “sophisticated financial network that supports nefarious activities” through prostitution, extortion and collection of dues.

Who does MS-13 target?

The gang is thought to target perceived rivals in immigrant communities. They can either be those perceived to have disrespected the gang, rival gang members, witnesses to crimes and anyone believed to cooperate with law enforcement, Nassau District Attorney Madeline Singas has said.

Most of the victims on Long Island have been young Latinos and blacks, many of school age, authorities say.

Who have their victims been so far?

MS-13 is responsible for 25 fatalities since January 2016, according to Suffolk and Nassau police.

The brutal beating deaths of two teenage girls in Brentwood in September 2016 shone a light on the violent nature of MS-13.

Kayla Cuevas, 16, was “involved in a series of disputes” in person and over social media with MS-13 members and associates in the months before the killings, prosecutors said in court papers. She and her best friend, Nisa Mickens, 15, were killed by four MS-13 gang members who had gone “hunting for rival gang members to kill” when they came across Cuevas and Mickens, court papers said.

At least one recent victim, Jose Pena, 18, was a member of the gang. He was suspected of being an informant.

In January 2017, the body of Julio Cesar Gonzales-Espantzay, 19, of Valley Stream, was found in the Massapequa Preserve stabbed with machetes and shot, according to court records.

In April 2017, a quadruple homicide in Central Islip was linked to the gang. The victims were Justin Llivicura, 16, of East Patchogue; Jorge Tigre, 18, of Bellport; Michael Lopez Banegas, 20, of Brentwood; and his cousin, Jefferson Villalobos, 18, of Pompano Beach, Florida, who had arrived on Long Island for a visit just days earlier.

The four were targeted by MS-13 because they had disrespected the gang and belonged to a rival organization, according to court documents. But only one of the four victims was friendly with MS-13 members and associates and was the main target, Suffolk police officials said.

The body of Angel Soler, 16, of Roosevelt, was found Oct. 19 in woods in the Roosevelt-Baldwin area. Federal and local investigators believe Soler was killed by MS-13 members, according to sources.

The remains of Kerin Pineda, 20, were found in thick woods near the Merrick-Freeport border and the remains of Javier Castillo, 16, of Central Islip, were found in Cow Meadow Park and Preserve in Freeport, also in October, authorities said. The FBI identified the remains of two men in November, officials said.

What can be done to curb the gang?

The gang has been identified as a top priority for the FBI.

Officials have said gathering intelligence is key to the effort. But prevention is also critical including in schools, and officials are focusing on that as well.

Suffolk police, the FBI and other law enforcement agencies have responded to suspected gang killings by beefing up their presence in Central Islip, Brentwood and other Long Island communities where MS-13 is active, since the quadruple homicide in April. State and county leaders, meanwhile, have poured millions of dollars into social services and gang-intervention programs aimed at eliminating MS-13’s most important asset, its recruits.

The 2019 budget approved by state lawmakers includes $16 million for social service programs to combat gangs in Nassau and Suffolk, including $3 million to Catholic Charities for case management of unaccompanied immigrant children who move to Long Island and are vulnerable to MS-13 recruitment.

Where else in the country is MS-13 a problem?

MS-13 has 10,000 members in at least 40 states, according to Attorney General Jeff Sessions, who spoke about the gang on Long Island in April 2017.

Nassau land deals saved acres of pristine property test

Nassau County’s environmental bond act program, which dedicated $100 million to open space preservation, saved scores of acres of pristine land that could have been vulnerable to development.

Though several purchases – including those from politically connected sellers – were never fully enhanced for public access, as promised, there were others where the public benefit appears to be uncompromised.

“I don’t want the public to be left with the impression they got screwed, because I don’t believe that,” said Citizens Campaign for the Environment executive director Adrienne Esposito, who served on the advisory committees that recommended open space purchases to then-County Executive Thomas Suozzi and the county legislature.

“I really feel this was an immensely successful program for Nassau County residents that leaves a better environmental legacy,” she said.

Voters approved the bond acts in 2004 and 2006. Between 2006 and 2012, Nassau closed on 23 properties totaling about 300 acres that the committees had recommended, using criteria such as size, connection to existing preserves and importance to groundwater supply.

Today, many are widely cited as successes:

  • The preservation of some of Nassau’s last remaining working farms. Under the first environmental bond act, the county spent $4.3 million on development rights to the 8.5-acre Meyer’s Farm in Woodbury and, in the second, bought the former 5-acre Grossman’s Farm in Malverne for $6.5 million, and the 2.5-acre Fruggie’s Farm in East Meadow for $2.1 million. The latter two have since been contracted out to nonprofits for continued operation.
  • The purchase of, or securing of development rights to, two portions of the Boegner Estate in Old Westbury. For $6.2 million, Nassau ensured that 47 acres would be preserved alongside Old Westbury Gardens’ existing 160 acres. The deal received legislative approval shortly before the 2006 death of the landowner, heiress Margaret Phipps Boegner, who had opened the nonprofit Gardens on the larger part of her family’s expansive grounds.
  • The acquisition of a Brookville horse farm, known as Old Mill, to ensure more affordable equestrian programs for all county residents, “not just for the select few,” as officials put it at the time. Nassau spent $12.1 million for the 40-acre site and has since contracted with a private company to run the renamed Nassau Equestrian Center.

Cynthia Cooper, a former Lakeview civic activist who served on the advisory committees, recalls researching the Old Mill property’s history and learning it was once a part of the Underground Railroad system that helped African-American slaves in the 1800s make their way into free states.

“It was one of the properties that really stuck with me,” Cooper said. “It had historical significance other than it being just a horse stable.”

The county also acquired land that helped connect a Mill Neck nature preserve with an existing Japanese stroll garden. It joined with the North Shore Land Alliance, the Oyster Bay nonprofit that played a significant role in the process, and a private investor to preserve a 60-acre field in Old Brookville.

That site had previously been owned by Banfi Vinters, but is now dedicated for use by local farmers.

The vista of rolling farmland over the horizon has become an attraction for visitors to nearby Youngs Farm, a popular purveyor of fresh produce and pies.

“That could be the poster child for what works in government,” the multigenerational farm’s owner, Paula Youngs Weir, said as she looked out the window of her farmstand shop.

Recycling is getting more expensive

Recycling programs across the country are facing higher costs as prices for recycled materials drop.

This week, Oyster Bay officials had a scare when Winter Bros. Hauling notified the town it would suspend its contract, in which it agreed to pay the town $25 per ton of recyclable material, and instead proposed that the town pay the company $65 per ton for all materials picked up. Ultimately, the company agreed to keep the contract through the end of the year.

But markets for recycled materials have been in turmoil since last July, when China announced it would ban imports of several types of plastics and mixed paper. China is a major importer of American waste, and with few buyers capable of matching China’s processing capacity, recyclers have been left with stockpiles of unsold material.

Scrap exports to China have all but halted in the last few months.

Waste and scrap exports to China

Source: U.S. Census Bureau

Crumpled

Wastepaper prices are down 44.6 percent from July 2017.

While China still accepts some forms of wastepaper like corrugated cardboard, it has tightened restrictions on contamination, practically banning most of the material produced in the United States. Paper makes up about half of recyclable solid waste, according to the Environmental Protection Agency. Demand for old corrugated containers had been growing in response to e-commerce, according to reporting by Resource Recycling, but the containers that would have gone to China have flooded the U.S. market.

Wastepaper Price

Source: U.S. Bureau of Labor Statistics

Flimsy

Recyclable plastics prices are down 4.3 percent from July 2017.

Plastics exports have been hit the hardest by the Chinese ban, falling 14 percent even before the ban went into effect, according to the Institute of Scrap Recycling Industries. Recycled plastics were already struggling to compete with cheap virgin plastics, according to a report from consulting firm More Recycling. The costs of processing out contamination put recyclers at a disadvantage, but consumer demand for recycled material could help raise prices.

Recyclable Plastics Price

Source: U.S. Bureau of Labor Statistics

Unshaken

Used beverage can scrap prices are up 23.1 percent from July 2017.

Soda cans emerged mostly unscathed by the import ban, which didn’t target beverage can scrap. But in April, China placed a 25 percent tariff on aluminum and 127 other United States exports, retaliating against tariffs imposed by the Trump administration.

Used Beverage Can Scrap Price

Source: U.S. Bureau of Labor Statistics