Patent ID: 7658976

Claim:
A method of printing three-dimensional objects wherein X, Y and Z each denote one of the three dimensions, the method comprising: dispensing, in a printing direction X from a nozzle array, droplets of building material in consecutive slices to form layers of a three dimensional object using a combination of two or more slice pixel maps, wherein each slice pixel map includes pixels arranged in pixel rows along the printing direction X and wherein the size of a pixel is smaller than the diameter of the droplets, by: printing a first slice according to pixel rows of a corresponding to a first group of pixel rows of a combined pixel map combining two or more slice pixel maps; shifting the nozzle array in a non-printing direction Y by a distance smaller than the diameter of the droplets according to a required resolution of the combined pixel map; and printing a second consecutive slice above the first slice in a Z direction according to pixel rows of a second slice pixel map corresponding to a second different group of pixel rows of the combined pixel map, wherein the first group of pixel rows of the combined pixel map are interlaced with the second group of pixel rows when the second slice is projected, downwards in the Z direction, on the first slice and a distance in the Y direction between a pixel row of the first slice and a pixel row of the second slice is smaller than the droplet diameter.