Space

First-ever 3D metal printing in space achieved on ISS

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The first shape created with the 3D Metal Printer
ESA/NASA
How the 3D Metal Printer works
Airbus
Animation showing the first print test
ESA/NASA
The first shape created with the 3D Metal Printer
ESA/NASA
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In an experiment that sounds about as safe as bobbing for fries, ESA carried out the first-ever 3D metal printing in space aboard the International Space Station (ISS). Built with Airbus, the Metal 3D Printer completed the first of four test shapes.

3D printing isn't new to the ISS. In fact, the first experiments aboard the station examining the technology began in 2014. However, these worked by melting plastic and then extruding it from a workhead controlled by a digital file to create various complex forms. The plastic doesn't get too hot and it's relatively easy to control even in zero gravity.

On the other hand, the Metal 3D Printer (couldn't they come up with a more imaginative name?) takes things to a whole new level. It also required some major tinkering with the basic metal printer principle to make it nearly safe enough to use on the ISS.

Animation showing the first print test
ESA/NASA

Generally, 3D metal printers work by laying down a bed of metal alloy powder, then sintering it with an electron beam or a laser in a pattern based on a digital file. A second layer is automatically spread, and the process is repeated. In the end, the excess powder is removed and the final product is ready for grinding and polishing.

It's bad enough to be melting metal in zero gravity, but trying to deal with metal powder is not only dangerous, it's completely impractical. Built by Airbus and Cranfield University in the UK, the Metal 3D Printer gets around the problem by mimicking the plastic printer. A stainless steel wire is fed into the workhead and a laser melts it on the spot before moving on, allowing the molten steel to immediately cool and set.

For added safety, the entire operation was carried out remotely in a sealed metal box.

How the 3D Metal Printer works
Airbus

According to the space agency, the printer completed the first of four test shapes in August. It wasn't much to write home about in terms of looks. In fact, it's rather crude, but the printer is a technology demonstrator to show how such a device could help future missions become more independent of Earth by allowing crews to manufacture spare parts or special equipment by themselves.

When all four test shapes are completed, they will be returned to Earth for analysis.

"With the printing of the first metal 3D shape in space, ESA Exploration teams have achieved a significant milestone in establishing in-orbit manufacturing capabilities," said Daniel Neuenschwander, Director of Human and Robotic Exploration at ESA. "This accomplishment, made possible by an international and multidisciplinary team, paves the way for long-distance and long-duration missions where creating spare parts, construction components, and tools on demand will be essential."

Source: ESA

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3 comments
MoNick
All right
paul314
Those shapes look like they're designed to go in some kind of strength testing rig. And to test overhang -- even in zero-g, I doubt you can extrude (accurately) too far away from a previous layer, because of the air flow from all the laser heat and the drag from the not-yet-melted wire. I wonder whether they extruded all of those pieces at once, or one by one with the wire extruder fitting between them.
Expanded Viewpoint
They hauled that heavy piece of machinery all the way out to space (extremely expensive ride) for that test? Why didn't they just use the "Vomit Comet" and get the exact same results much more cheaply? Laser welding is a fairly new and exciting technology, and that is all this is.
There is no drag from the wire coming out of the guide, the wire is just sitting there, touching the surface, ready to be melted.