System and methods for construction 3D printing

A construction three-dimensional printing system comprising:

• a construction three-dimensional printer including:
• a tower including a lower section and an upper section, the upper section being pivotally mounted on the lower section to enable the upper section to pivot from a vertical orientation to a horizontal orientation and vice versa;
• an articulable arm that extends from the tower, the arm including a proximal arm segment that is mounted to the tower at its proximal end and that extends horizontally outward from the tower, and a distal arm segment whose proximal end is pivotally mounted to a distal end of the proximal arm segment, wherein the arm is configured to vertically travel up and down along the tower and wherein the distal arm segment is configured to be rotated relative to the proximal arm segment within a horizontal plane;
• a nozzle assembly mounted to a distal end of the distal arm segment of the articulable arm, the nozzle assembly being configured to receive printing material and extrude the printing material to fabricate three-dimensional structures;
• and
• a rover upon which the tower is mounted, the rover including a chassis and being configured to move the construction three-dimensional printer around a construction site,
• wherein the construction three-dimensional printer can be placed in a compact orientation that facilitates transport of the three-dimensional printer by positioning the proximal arm segment of the articulable arm on the lower section of the tower, pivoting the upper section of the tower downward into the horizontal orientation, and rotating the distal arm segment of the articulable arm inward toward the lower section of the tower to place the upper section of the tower, the proximal arm segment, and the distal arm segment into alignment with each other.