William, both materials and processes are still in development, as we mentioned in the article. I think a bigger challenge than materials development will be the point you mention about power sources.
Didn't know that printing on the Moon or Mars would require working in a "zero gravity" environment. Low gravity, as compared to earth maybe, but not zero gravity. If you are going to be making stuff to be used on the surface it would make no sense to transport it to space and then back to the surface as that would have a heavy cost in fuel that would be in short supply.
Lunar Regolith sounds a lotlike moon dust, which should be available in adequate quantities on the moon, it seems.
What are the mechanical properties of the parts fabricated thus far, and are they actually useable? I know that the first 3D printed parts were primarily useful for visualizing and not much else. But tha was in 1988.
Producing parts from the materials listed does not seem like they would be very tough, but rather very hard and quite brittle, unless some additional work was done on the mixture prior to laser sintering. I see a real challenge in providing a uniform particle size and uniform chemical composition.
Providing enough power to run the 3D printer is the other challenge that could be an obstacle to using the process onthe moon, although with an adequate solar array enough power should be available.
If more information is available a discussion of the properties of the material will be an interesting presentation indeed.
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