Patent ID: 9662838
Date: 2017-05-30
CPC Classifications: B29C,B33Y

Claim:
1. A method for printing 3-D objects with a scanning 3-D printing system, the method comprising: dispensing building material from a printing platform while moving in a printing direction that is an X direction one pass at a time and layer by layer, wherein at least one layer includes multiple passes; shifting the printing platform in an indexing direction that is a Y direction along a Y rail prior to dispensing a subsequent pass of a layer, wherein the Y direction is perpendicular to the X direction; and leveling the building material after each dispensing of a pass in a layer with a roller rotatably mounted on the Y rail that extends over all passes of the printing system, wherein the Y rail is stationary in the indexing direction and is movable in the printing direction; wherein the roller and the printing platform are supported by and moveable along the Y rail and the roller is shifted with respect to the Y rail in the indexing direction together with the printing platform.