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3D-printed ceramic parts made from lunar regolith by European Space Agency

I had to look up regolith, but wow, these are effectively parts 3D printed with dirt.

"Normally their print process is based on materials such as aluminium oxide, zirconium oxide or silicon nitride. What we've demonstrated here is that it can also work with raw regolith, which is a collection of various different types of oxides, chiefly silicon oxide but also aluminium, calcium and iron oxides, among others."

Ground and sieved down to particle size, the regolith grains are mixed with a light-reacting binding agent, laid down layer-by-layer then hardened by exposing them to light. The resulting printed part is then 'sintered' in an oven to bake it solid.
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