(For the uninitiated: The B suffix stands for “biocompatible,” meaning the unit can 3D-print materials for medical applications. Formlabs has made inroads into the dental and medical industries, making cheap, custom-designed dentures as well as training models, prostheses and custom-fit medical equipment.)

The faster print time is enabled by better hardware, including a new print engine and a new light processing unit, as well as better resins. Formlabs is today announcing a set of new resins, including ones that help you crank out quick-and-dirty initial prototypes, as well as ones with more rigidity and color retention. Plenty of effort has also been jammed into ensuring that the resins (and the printers themselves) last longer, making prints cheaper and more efficient. The company is suggesting that prints made with the new gear will be around 40 percent lower thanks to the efficiency savings made elsewhere. This emphasis on speed, efficiency and lower cost should help bolster the sales pitch that these units are ready for bigger and better manufacturing jobs.

The Form 4 and Form 4B are available today, priced at $4,499 and $6,299, respectively.

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The call to challenge the status quo was controversial from the start — it not only was going to impact thousands of studies and experiments, but many scientists argued that computer models were nowhere near ready to replace animals as test subjects. In a letter written by a group of public health officials, the experts urged the EPA’s head Michael Regan to reconsider the ban because computational models, in their opinion, were “not yet developed to the point” where they could be relied on for risk assessments.

In order for the new ban to have taken effect, the EPA said there needed to be “scientific confidence” that non-animal models could soundly replace critters like mice and rabbits in labs. Despite the 2035 deadline being put on ice, however, an EPA spokesperson told Science that it would still explore alternatives to animal testing.

The ambitious plan is not entirely a lost cause, though. While the EPA hasn’t made any official statements about how it plans to work toward its original goal, now without a deadline, some studies have shown promise that computational models might effectively reflect the toxicology of certain chemicals during testing. In some instances, these studies suggest, they can even outperform lab rats.

3D developments like technical organoids are also popping up on the research front by way of stem cells that allow duped livers to be tested and evaluated during research as a human liver would. Labs are currently working on ways to more effectively develop realistic organs using 3D printers. But it might be a while before 3D printing can consistently be used to assist biologists and pharmacologists for research and drug testing.

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It’s called liquid metal printing (LMP) and involves directing molten aluminum along a predefined path into a bed of tiny glass beads. These beads quickly harden into a 3D structure. Researchers say the new process is at least ten times faster than comparable metal manufacturing techniques.

However, there is one major caveat. This process sacrifices resolution for speed and scale. This is why the researchers have used it to create low-resolution items like chair legs and not, say, intricate parts with complex geometries. MIT researchers say this trade-off still makes the technology useful for creating “components of larger structures” that don’t require extremely fine details. This includes furniture parts, as mentioned above, but also components for construction and industrial design.

Despite the resolution downgrade, parts made using LMP are still durable and can withstand post-print machining, like drilling and boring. The folks behind this technology say the builds are much more durable than those built with wire arc additive manufacturing, which is a pre-existing metal printing method. This is because LMP keeps the material molten throughout the entire process, lessening the chances of cracking and warping.

The researchers recommend combining LMP with other techniques for jobs that require both speed and a high resolution. “Most of our built world — the things around us like tables, chairs, and buildings — doesn’t need extremely high resolution”, said Skylar Tibbits, a senior author of a paper that introduced the project.

It’s also worth noting that this printing method doesn’t require aluminum. It can work with other metals. The researchers chose aluminum due to its popularity in construction and the fact that it’s easily recycled.

The folks behind this tech hope to keep iterating on the concept to improve heating consistency, to prevent sticking, and allow for greater control over the molten metal. The team’s been having issues with larger nozzle diameters leading to irregular prints, which is something that needs to be worked out. Tibbits said the method could eventually become a “game-changer in metal manufacturing.”

Despite slightly falling out of favor in the commercial space, 3D printing has grown in leaps and bounds in recent years. Researchers have developed a tiny 3D printer that actually gets inserted into the body to repair and clean damaged tissue. Scientists also recently printed a working piece of the human heart.

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Astronaut Andreas Mogensen will install the printer, which Airbus developed for the European Space Agency. The machine will then be controlled and monitored from Earth.

Polymer-based 3D printers have been employed on the ISS in the past, but metal 3D printing in orbit is said to pose a trickier challenge. The machine will use a form of stainless steel that’s often used for water treatment and medical implants because of how well it resists corrosion.

After the stainless steel wire is pushed into the printing area, the printer melts it with a laser said to be a million times more powerful than a typical laser pointer. The printer then adds the melted metal to the print.

The melting point of the metal is around 1,400°C and the printer will run inside a completely sealed box. Before the printer can operate, it needs to vent its oxygen into space and replace its atmosphere with nitrogen. Otherwise, the melted metal would oxidize when it became exposed to oxygen.

Given the higher temperatures that are employed compared with a plastic 3D printer (which heats to around 200°C), “the safety of the crew and the Station itself have to be ensured — while maintenance possibilities are also very limited,” ESA technical officer Rob Postema told the agency’s website. “If successful though, the strength, conductivity and rigidity of metal would take the potential of in-space 3D printing to new heights.”

Four test prints are scheduled. The printer will replicate reference prints that have been created back on Earth. The two versions will be compared to help scientists understand how printing quality and performance differs in space. Even though each print will weigh less than 250g (8.8 ounces) and be smaller than a soda can, it will take the printer between two and four weeks to create each one. The printer will only be in operation for a maximum of four hours each day, since its fans and motor are fairly loud and the ISS has noise regulations.

If the experiment goes well, it will pave the way for astronauts and space agencies to print required tools or parts without having to send the items on resupply missions. Metal 3D printing could also help with the construction of a lunar base using recycled materials or transformed regolith (moon soil and rock). It may come in useful for missions to Mars too.

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