However, that doesn't mean something like this couldn't work on an industrial scale in the future. There's a UK TV programme I saw last week about house building (it's called Grand Designs, if you want to look it up) which featured a house made entirely from CNC milled ply-wood boxes that were made 'on-demand' onsite, using a computer controlled milling machine shipped in on...a shipping container.
It is not a massive step from a CNC miller in a portable shipping container to a 3D printer. There are several advantages (...and disadvantages) to this approach, including being able to re-make pieces on-site should you have to make adjustments due to environmental conditions.