Even if all it could do was make plant pots, being able to print a pot design which could grow a given crop while using half the water of open irrigation would

Even if all it could do was make plant pots, being able to print a pot design which could grow a given crop while using half the water of open irrigation would be huge. That's well within the range of sub-irrigation systems, and the beauty of 3d printing is that prototyping and experimenting with new designs is trivial once the system is set up.