On topic of Artemis - and of Mars - 3D printing regolith.
I'll point out (with Zubrin) that a shelter built with this will do a bang-up job protecting electronics, on the surface, from radiation. It'll make skywatching a lot easier too half the month. It is, further, the ice-box for all this. It certainly beats out digging a big hole in sharp powdery regolith. If your colony is not in some polar crater then hoorah, you just brought the pole to you.
Once you pressurise this rego-'gloo with 100 MPa of gas, though: it will just go bang. Until the sound cuts out in this near-vacuum.
Lavatubes are where it's at. If any of us are to live there.
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