Spin me right round –
Rotational 3D printing could have your model printed in 90 seconds.
Ron Amadeo – )
Your 3D printer is not a real 3D printer until you print 3D Benchy, a popular torture test that takes the form of this cute toy boat.
EPFL
Here’s how this works. The blue laser beam hits a DLP chip and produces the resin hardening image for each rotation angle, while the yellow resin container spins around in sync with the image being projected. All the red beams are just a camera system, which is used to monitor the print.
EPFL
And here’s the real thing in action. It’s purple and pretty.
EPFL
3D printers are great for rapid prototyping and building low-volume, specialized parts, but they sure can take a while. Today’s 3D printers might be
called “3D printers” but really, the print heads work in 2D. A 3D model is sliced up into hundreds of 2D horizontal layers and slowly built up, one layer at a time. This layer-by-layer process can take hours or even days, but what if we could print the entire model at once? A new technique demonstrated by researchers from Switzerland’s
Ecole polytechnique fédérale de Lausanne (EPFL) —and further detailed in this Nature article – does just that and can print an entire model in seconds.
The new technique builds a model by hardening a photosensitive resin with a laser, not unlike existing stereolithography (SLA) printers. The big difference here is the application of techniques, the same used in x-rays and ultrasounds, that allows for rotational printing. Laser light is modulated with a (DLP) chip (just like in old rear-projection HDTVs) and is blasted into a container full of resin. The laser covers the entire build volume, and the container of resin actually rotates while it’s being exposed to the light. The laser projects the model at different rotational perspectives, which is synced up with the spinning resin, and a whole 3D model can be produced in seconds.
The EPFL writes, “The system is currently capable of making two-centimeter structures with a precision of 97 micrometers, about the same as the diameter of a strand of hair. But as the team develops new devices, they should be able to build much bigger objects, potentially up to 20 centimeters. ” In this first public demonstration, the build volume is (mm ×) (mm ×) mm, making it one of the smallest 3D printers on earth. An um resolution is also nothing to write home about and can be bested by ~ $ consumer SLA printers . It is very fast, though, and the technique is just getting started.
Another benefit to this printing technique is that by printing an object suspended in the print solution, there is no need for additional support structures. The EPFL says this makes the technique a good idea for printing delicate or soft objects, including 3D bioprinting.
The researchers have set up a spin-off company called “ (Readily 3D) “to develop and market the technology.
(Listing image by EPFL)
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