Patent ID: 8609204

Claim:
A method of fabricating 3-D objects, comprising: selectively depositing two or more different building materials, in layers, on a depositing surface, using two or more inkjet printing heads, each of said layers corresponding to a cross section of a three-dimensional object to be fabricated, wherein at least one of the layers includes at least two of said two or more different building materials; and transferring, layer by layer, a deposited layer from the depositing surface to a fabrication tray prior to depositing a subsequent layer by providing relative movement between the object being fabricated on the fabrication tray and said deposited layer, until said deposited layer and a previously transferred layer make contact and are merged, wherein a time interval between depositing the deposited layer and merging the deposited layer with the previously transferred layer is selectively configured in accordance with the three-dimensional object being fabricated and desired degree of solidification of the deposited layer such that the time interval is larger if the deposited layer is required to be self-supporting and smaller if the deposited layer is not required to be self-supporting.