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Portrait transmitted via 3D printing
by Staff Writers
Paris (ESA) Nov 06, 2020

In data transfer tests, Zortrax engineers achieved a maximum transfer rate of 115 200 bits per second.

This portrait of the Mona Lisa was transmitted via a very special route: its data arrived on this screen through a 3D-printed, space-grade polymer. This achievement marks the first step towards a future when plastic printed parts can incorporate their own power and data links within their built structures, instead of relying on separate wiring and circuits.

ESA non-metallic materials and processes engineer Ugo Lafont explains: "In recent years we have been working on 3D printing using 'polyether ether ketone' - or PEEK - which is a tough thermoplastic with a melting point up around 350+ C, able to do the equivalent job of some metal parts.

"As a next step we worked with Portugese company PIEP to make the printable PEEK electrically conductive, by adding carbon nanotubes and graphene nanoparticles in just the right proportions.

"Now we asked Polish firm Zortrax, with reliable dual-print commercial printers in their portfolio, to produce test parts. We supplied them with samples of our two PEEK variants, then the company worked on optimising the dual-print parameters to reliably print electrically conductive paths through a standard PEEK body."

In data transfer tests, Zortrax engineers achieved a maximum transfer rate of 115 200 bits per second.

"To the best of our knowledge, this was the world's first data transfer done through a device 3D printed entirely out of space-grade PEEK polymers," says Michal Siemaszko, heading R and D at Zortrax. "Future lines of research will include printing components with functional USB ports to enable connecting the 3D printed models to computing devices directly, with no need for converters."

Zortrax's challenge was to implement printing with two different PEEK materials in dual extrusion. Achieving sufficiently high dimensional stability involved enhancing the rigidity of the extruder module. Increased extrusion temperatures up to 480C degrees had to be combined with controlling the temperature of the printing chamber and build platform - to a maximum 200C and 220C respectively - to minimise the risk of warping or shrinkage of printed parts.

Because the printer has a large build space of 40 x 30 x 30 cm, entire 1- or 2-unit CubeSats - small, cheap nanosatellites built up from standardised 10-cm boxes - could in principle be printed in the future.

"A capability to 3D print simultaneously with two space-grade polymers paves the way to manufacturing composite components tailored to specific applications in the space industry," says Jacek Krywko, technology solutions research specialist at Zortrax.

"This material has many potential applications and we are already evaluating other properties related to its compatibility to the space environment," says Riccardo Rampini, heading ESA's Materials' Physics and Chemistry Section. "We started with charging and electrostatic discharge properties, then UV radiation compatibility, next will come atomic oxygen resistance."

The technology could also be applied to what is referred to as '4D printing', with the fourth dimension being time. By using materials that change their properties in response to temperature or electrical current, features could be included that change their shape as needed.

Related Links
Space Technology News - Applications and Research

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3D print experts discover how to make tomorrow's technology using ink-jet printed graphene
Nottingham UK (SPX) Nov 05, 2020
The University of Nottingham has cracked the conundrum of how to use inks to 3D-print novel electronic devices with useful properties, such as an ability to convert light into electricity. The study shows that it is possible to jet inks, containing tiny flakes of 2D materials such as graphene, to build up and mesh together the different layers of these complex, customised structures. Using quantum mechanical modelling, the researchers also pinpointed how electrons move through the 2D materia ... read more

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