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Engineer develops 'leap forward' for 3D printers

Lawrence Livermore National Laboratory engineer Bryan Moran has created faster, bigger printer that projects an image onto a liquid resin that hardens when hit by light in order to create 3D objects. [Photo by Julie Russell/LLNL]





Lawrence Livermore Lab engineer Bryan Moran wasn't necessarily looking to improve on 3D-printing technology when he moved over to Additive Manufacturing three years ago, but he may have done just that.

Moran's creation, a new take on a process called projection micro-stereolithography, which uses UV light to create 3D objects, won him a coveted R&D 100 award in Las Vegas on Nov. 13, 2015.

"It's a leap forward because it's combining two existing techniques in a unique way," Moran said. "It's enabling things that you just wouldn't have thought of because it wasn't practical before."

Simply put, Moran's printer, called the Large Area Projection Micro-Stereolithography (LAPuSL), projects an image onto a liquid resin that hardens when hit by light, to create 3D objects. Because his machine combines the extraordinary detail (resolution on the order of micrometers) inherent to direct light processors with high speed and a larger scan area, it gives operators the ability to make larger and more complex objects at higher speed. This enables the production of large components with fine features such as micro-architected materials with overall sizes around 10 cm, containing individual features in the micrometer range.

The machine combines the extraordinary detail (resolution on the order of micrometers) inherent to Direct Light Processors with high speed and a larger scan area, to make larger, more complex objects at higher speeds.





"Irritation is the mother of invention, and people were annoyed that they couldn't make things bigger yet maintain small feature sizes (using projection micro-stereo lithography)," Moran said. "I did the research and the math and figured out how to make it work. It's the combination of the projector with the scanning of a detailed image. You can easily cover a much larger area with the same level of detail as that contained in one exposure of the projector. The advantage is also in the speed. It's a lot faster."

The reason the printer is so fast, Moran said, is that instead of having a single static exposure with millions of mirrors, it scans over a wide area, multiplying and overlapping the high-resolution images using software developed by the LLNL team.

Moran, who had a background in lasers and optics before moving to the Additive Manufacturing group, has filed for a patent on the printer, but he isn't finished improving it. He's already nearing completion of an upgrade that will increase the build area of the LAPuSL by a factor of 10, which will operate at 10 times the speed producing features that are five times smaller. The second version will use custom optics developed at the lab, along with larger scan mirrors, giving operators the ability to print complex objects up to the size of a dinner plate.

"The new system should really fly," Moran said. "There is a path to making really large items with small features very quickly. It opens up the application space to new possibilities."

Source: Lawrence Livermore Lab

Published May 2016

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