Hey, Bob, can we get one? Even just for kicks?
We need one if you ask me. It's almost like a vacuum cleaner, but it solidifies the dirt which becomes a floor.
Imagine, no more bags!
Keep in mind, when we "abandoned" our robots on the Moon, we also left a considerable amount of raw material for unplanned experiment and analysis.
While the exterior spider robots are going about their work, the smaller versions inside can cobble up some devices to try from the electromagnetic supplies we sent along. I think any lunar magnetrons we build should be tunable, until we can determine which frequencies and intensities work best.
My first thought was that this would be a good way to stabilize our electromagnetic launch facility elements. We will also see if our excavations disclose similar properties in the buried materials. That would make them excellent "bricks" for the walls of any tunnels we make. And we could also glaze them to facilitate building sections with a breathable atmosphere.
If things go well, by the time we return, there will be a sustainable amount of fresh air and water. The first lunar colony could be built for us by the robots and equipment we left, but then, that's one of the reasons we left them. I'm glad I thought to include those carefully packed seeds and cell cultures.