I thought the problem with printing houses is that they look bad and that the constructing the frame (walls) isn't that expensive or lengthy compared to all the

I thought the problem with printing houses is that they look bad and that the constructing the frame (walls) isn't that expensive or lengthy compared to all the rest of it: excavating and laying the foundation; installing roofing, windows, and doors; adding electrical and plumbing conduits and appliances; painting/carpeting/tiling. A house builder machine that could wheel in and do all but the electrical, plumbing, and appliances would be pretty impressive. It'd need a variety of attachments for digging and leveling, pouring concrete, printing walls, filling insulation, and manipulators for placing beams, windows, and doors. That last part probably needs human workers too, so the machine needs to be safe to work around. All that sounds very expensive. Useful on the Moon and beyond, maybe so useful on Earth. Also worth looking at factory-built houses.