It's an interesting way of doing it, but the machine will have to be a lot quicker than current 3D printers if they want to feed an entire spacecrew and still get decent texture out of the finished product. I suppose it can't be that hard for foods like pepperoni pizza, but the fibrous texture of most meats and vegetables could be quite challenging to replicate. Also, I wonder if the food comes out already cooked (yet still cold, maybe?) or still needs cooking.