Well I disagree, there are a few Company's doing a '3D Print' of traditional rammed earth form-work. Unless you have actually worked in construction this concept might be hard to conceptualize. One of my compatriots has invented a Brick Laying robot that should be all over the business news real soon. My younger brother designs and builds domestic 3D Printers from scratch so I am around and watching this technology evolve daily at a circuit board level.
Both names are sound and have plenty of potential, maybe not today but within the next few years, absolutely.
Regards
matt
PS.
Don't be surprised when Geo-Printers are Terraforming the landscape, hence 3DPrintLAND.com.