Yep! 3d printing goes layer by layer from the bottom up, and is of course subject to gravity. When printing “bridges” over empty space, it’s easy in small plastic prints to use supports because plastic filament is cheap, but these same bridges are much much much harder and more expensive to do with concrete.

This is a real breakthrough of 3D printed building usefulness. Houses will be closer to what humans expect and want from a domicile, and able to house twice as many people on the same acreage.