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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.

Starting at 04:12:

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?

uhoh
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    May be a similar process to make Mineral Wool may be used. – Uwe Sep 23 '18 at 09:00
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    From @Uwe's link "More advanced production techniques are based on spinning molten rock in high-speed spinning heads somewhat like the process used to produce cotton candy" but cooling the material may be a problem –  Sep 23 '18 at 11:15
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    So should this work, will Earth be exporting its plastic trash towards Luna in exchange for He3-rich regolith? That's the start of another scifi novel.. – AtmosphericPrisonEscape Sep 23 '18 at 11:29
  • @JCRM this was sounding familliar, then I remembered this. Searching stone wool, rock wool and mineral wool finds a lot of resources, but they seem to start with known-low-melting point materials like solidified lava. (more YouTubes: 1, 2, 3, 4) – uhoh Sep 23 '18 at 16:30
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    Glas wool is made on Earth too requiring the relative high temperature of molten glas. Molten lunar regolith may be similar to molten glas. – Uwe Jan 09 '19 at 14:50
  • @Uwe I finally found what I was thinking of, it only took eleven months! rockwool/mineral wool: 1, 2, 3, 4, 5, https://www.youtube.com/watch?v=t6FWPTZjwLo Please feel free to put together an answer if you're interested. update: oh, many of these I already posted above, oh well. – uhoh Dec 11 '19 at 10:28

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