i think digging a bunker and covering it with a airlock hatch would be way easier and cheaper than making an entire building on mars. All you need is a rover back hoe instead of a 3d printer, and water, and regolith and all that crap. also, it would be more easily expanded, just dig more tunnels from the inside and you dont even need a space suit to do it. Lastly, it is less susceptible to damage from thermal expansion and fatigue and would be better insulated.

only disadvantage, i guess, would be living in a cave would suck.