It’s constructed using waste material from lumber mills, which Maine has a ton of. Tons of savings in material and labor costs.

“University of Maine notes in a press release that four large 3D modules were printed before the home was assembled in roughly half a day, and an electrician took two hours to fully wire it — a far cry from traditional construction methods and materials”

https://hypebeast.com/2022/11/3d-printed-recyclable-house-university-of-maine-biohome3d