Are 3D-printed houses a viable construction option?

Our INSIDER Question of the Week: Italian company World’s Advanced Saving Project (WASP) has recently organized workshops and invited local makers to try out the firm’s patented BigDelta, a 40-foot-tall 3D printer that creates affordable, sustainable homes. Constructed from a locally sourced mix of dirt and straw, the ecological houses are designed for developing countries with limited natural resources, such as wood, aluminum, and even mud. What do you think? Are 3D-printed houses a viable construction option?