Patent ID: 9017589
Filing Date: 2015-04-28
Classification: B29C,B29L,B33Y,B41M

Abstract:
1. A method for forming three dimensional objects, the method comprising: printing building material, layer by layer, to form a three dimensional object on a printing tray by moving a printing block in forward and reverse passages, the printing block comprising a printing head, at least two curing sources and a leveler, wherein the printing block moves in a forward passage and reverse passage for dispensing a single layer and the printing comprises: moving the printing block in the forward passage, in which a first part of a layer being built is deposited and cured by one of the curing sources; adjusting a height position of the printing tray relative to the printing block and the printing tray prior to printing a reverse passage; and moving the printing block in the reverse passage, in which a second part of the layer being built is deposited and cured by another one of the curing sources.