EPFL develops a new high-precision laser 3D printing method

At EPFL, researchers have developed a new, high-precision method for 3D printing small and soft objects. The team of researchers in Lausanne, Switzerland explained that this new technology could have applications in a wide range of fields, including bioprinting. One of its advantages over existing methods is its ability to print different textures within the same object, which could be used to make tissues, organs, hearing aids and mouthguards for example. In order to bring the system to market, a spin-off company, Readily3D will be further developing the technology.

The process used by the researchers at EPFL is considered additive manufacturing but does not use the typical layer-by-layer approach. Instead, solid spots are formed step by step to create the object from a translucent liquid polymer. Essentially, the liquid polymer is added to a rotating platform, which is then hit by a laser. Paul Delrot, Readily3D’s CTO explains: “The laser hardens the liquid through a process of polymerization. Depending on what we’re building, we use algorithms to calculate exactly where we need to aim the beams, from what angles, and at what dose.”

Diagram of EPFL’s technology | Credits: EPFL / LAPD / Nature Communications

High-precision laser 3D printing for medical applications

In addition to being able to fabricate soft objects with varying textures, this technology can also create very small and precise parts in a very short amount of time. Currently the system is capable of making 20 mm structures with a precision of 80µm, about the same as the diameter of a strand of hair. The team explained that as they work on developing new devices, they should be able to build much bigger objects with the same precision, potentially up to 150 mm.