Abstract: A printer and a method of printing a 3D object are based on a computer model. To allow different engineering properties of the printed object, the printer allows a user input defining at least two portions of the 3D object and a desired engineering property of each portion. The printer is configured to define the lines of an inner structure of the object such that the lines extend continuously across a transition from one of the least two portions into the other portion, and the printer is configured to change the cross-sectional shape of each line in the transition in accordance with the desired engineering properties.

Abstract: A printer for printing a 3D object based on a computer model, the printer comprising a tool for extruding or solidifying material, a stage supporting layers of the object; motion structure defining the shape of the layers, and a controller configured to make a path to be followed for making the object. To increase at least one of the speed and the precision by which the object is made, the controller is configured to define the path by defining a plurality of line segments and by defining transition segment for insertion between the line segments. The controller is further configured to only demand material deposition along the line segments and not along the transition segments.

Abstract: A printer for printing a 3D object based on a computer model, the printer comprising a tool for extruding or solidifying material, a stage supporting layers of the object; motion structure defining the shape of the layers, and a controller configured to make a path to be followed for making the object. To increase at least one of the speed and the precision by which the object is made, the controller is configured to define the path by defining a plurality of line segments and by defining transition segment for insertion between the line segments. The controller is further configured to only demand material deposition along the line segments and not along the transition segments.