China: Recycled Concrete Houses 3D-Printed in 24 Hours

``A Chinese construction firm based in Shanghai has succeeded in building 10 houses each measuring 200 square metres in 24 hours by using an enormous 3D printer. The houses are all eco-friendly and constructed from 3D-printed building blocks made from layers of recycled construction waste and glass fibre and mixed with cement. Each home costs less than £3,000 to build.'' -- How many years until this totally up-ends the homebuilding industry?