A ground-based prototype for a new microgravity 3D printer is now complete and awaits deployment to the International Space Station (ISS) for testing. Capable of 3D printing parts much larger than itself, the new machine dubbed IMPERIAL overcomes one of the main constraints of current off-Earth 3D printers, limited build volume.
Up until now, we have been amazed by a handful of additive manufacturing (AM) systems that have successfully built components in orbit, such as Made In Space (now part of Redwire)’s Additive Manufacturing Facility (AMF), which became operational in space in 2016, or Tethers Unlimited Refabricator 3D printer onboard the ISS. Now the European Space Agency (ESA) announced that its highly anticipated IMPERIAL 3D printer model is finalized. Once at the ISS, the 3D printed parts could demonstrate extraterrestrial manufacturing potential, enabling new maintenance and life support strategies for human space flight.
Built to operate in weightlessness––meaning it can work upside down on Earth––the printer is capable of creating high-performance polymer parts of unlimited dimensions along a single direction and with mechanical and thermal properties like PEEK. Moreover, according to the technical characteristics of the machine, it can develop large parts with minimal waste that are ready to use directly after their removal from the 3D printer, as post-processing would imply the presence of additional dedicated facilities.
The project was undertaken for ESA by a consortium led by German space technology firm OHB SE, with Berlin-based space engineering company Azimut Space; the Athlone Institute of Technology in Ireland, and Portuguese 3D printer manufacturers BEEVERYCREATIVE. Now that the ground-based prototype is complete, the next step would be to test it in orbit aboard the ISS.
Commenting on the development, OHB SE Project Manager Antonella Sgambati noted that “fused filament fabrication with high-performance polymers has been already demonstrated to be unimpacted by a reduced gravity environment, paving the way for new challenges such as the possibility to print unlimited parts in one direction or else exploit batch production. In the frame of the project, new technological gaps have been identified and covered by development and prototyping testing at BEEVERYCREATIVE which led to this unique achievement, bringing out-of-Earth manufacturing one step closer.”
One of the biggest accomplishments of the team behind IMPERIAL is that it can print under microgravity conditions with a quality comparable to printing under nominal circumstances. Moreover, the developers designed the 3D printer to fit the available upload configurations and corresponding loads. Taking into account the environmental, interface and operations, and safety requirements of the ISS, the technology was selected based on the resources available onboard the ISS. And since the station is permanently occupied by a crew of at least seven people, IMPERIAL said the machine guarantees their general health and safety.
This is not the first time ESA and this same international consortium have worked together. Back in 2018, the team presented MELT, short for Manufacturing of Experimental Layer Technology, a fully functional 3D printer prototype able to work under the ISS’s microgravity conditions and 3D print with engineering polymers with high-end mechanical and thermal properties. Project MELT was successfully delivered to the ISS in 2018 as a fully functional microgravity 3D printer prototype.
Much like its predecessor, the IMPERIAL project found the team working once again to supply off-world crews with a fully functioning 3D printer model that uses engineering thermoplastics, but this time, it has the added advantage of alleviating build volume constraints. Structurally the two 3D printers are similar, but IMPERIAL goes one step further by releasing the 3D printed part as it is printed, and that advantage will make a huge difference to future space explorers that will require machines to churn out spare parts or tools that might exceed the size of the printer.
Once operational, IMPERIAL could contribute to increasing the autonomy and sustainability of future long-duration space missions. Or as BEEVERYCREATIVE’s Chief Technology Officer Mario Angelo pointed out “this new project is a validation of our ability to develop technology in an area [aerospace] which will certainly have a great impact on our future lives.”
Even though the platform will travel 248 miles for testing aboard the station, the technology itself and the knowledge gained from the IMPERIAL project could be leveraged to develop new, industry-oriented 3D printers for product development needs right here on Earth. In fact, facilitating the commercialization of space technology in non-space markets is quite common. NASA for example has turned plenty of space ideas into Earth-bound products. As promising space technologies continue to emerge, advanced products will trickle down into many other non-related industries that will benefit from time and cost reductions in manufacturing processes.
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