Abstract: An additive fabrication method using a fluid construction material which can be solidified, trowels defining first and second surfaces, and a nozzle for delivering fluid material to a predetermined location, including the steps of moving the trowels and nozzle along a predetermined path defining an enclosed area, delivering fluid material to the nozzle to extrude the material in a layer as the nozzle is moved along the path, with the first and second surfaces moving with the nozzle to produce a wall of the extruded material forming an enclosed area with a shaped outer surface and a shaped top surface, and delivering fluid material to the enclosed area.

Abstract: An additive fabrication apparatus using a fluid construction material which can be solidified, and including a fluid material extrusion assembly including trowels defining first and second surfaces, a first nozzle for delivering fluid material to a predetermined location, a first control for moving the extrusion assembly along a predetermined path defining an enclosed area, a first supply for delivering fluid material to the extrusion assembly to extrude the material from the first nozzle in a layer as the first nozzle is moved along the path, with the first and second surfaces moving with the first nozzle to produce a wall of the extruded material forming the enclosed area with a shaped outer surface and a shaped top surface, a second nozzle for delivering fluid material to the enclosed area, a second control for moving the second nozzle to position the second nozzle at the enclosed area, and a second supply for delivering fluid material to the second nozzle to fill in the enclosed area.