Net-Zero-Energy buildings are rare and upgrading existing structures will be an immense undertaking. 3D-printing is also on the rise and here we have a prime example of both. Utilizing Branch Technology's freeform process, the Curve Appel 3-D Printed House will be the first of it's kind. Inspired by the Case Study Houses of the 1950's, the home will use solar carving and passive mechanical systems to achieve its net-zero-energy status. WATG is the firm responsible for this ground-breaking new construction.