The Verge Science video Building a lunar base out of Moon dust discusses using harvested lunar regolith (powder-like) mixed with a polymeric resin produced from "space trash" (I'm imagining discarded plastic food pouches for example) to make a structural material that can be 3D printed for building.
So you mush it together in a very specific mixture ratio, and what you get is a polymer composite concrete. And so you can make that polymer composite concrete either using the granular material right off the ground, or you can heat up and draw out that granular material into a glass fiber. and then if you use the glass fiber, it makes the material really strong, like carbon fiber or kevlar.
What does the process of converting regolith to glass fiber look like? Is it done in a tower, like drawing optical fiber, or squeezing molten rock through a mesh of tiny holes? Something else?