This week's Question: San Francisco-based startup Apis Cor recently used its giant 3D printer to build a small home — in under 24 hours, according to the company. The mobile technology printed out the house's walls, partitions, and building envelope; then, a group of contractors installed insulation, windows, appliances, and a roof. Apis Cor says the homes can be built for a cost of approximately $10,000. What do you think? Is 3D printing the future of construction?