https://phys.org/news/2018-07-idea-d-moon-home.html

The aim would be to 'live off the land' as much as possible, by printing as many structures, items and spares out of lunar regolith as possible, or by using and reusing materials brought for the mission, rather than continuously relying on the long, expensive supply line from Earth.

Maximised 3-D printing would also allow on-demand production of items and spares with routine recycling of materials available within the base, making lunar settlement much more self-sufficient and sustainable.