Selective post-exposure

An additive manufacturing method for manufacturing three-dimensional objects by applying a building material in a layer by layer manner, where the layers correspond to respective cross-sections of a three dimensional object that is built by solidifying the building material through application of energy to positions in each of the layers that are assigned to the respective cross-sections, the method comprising:

• providing an energy input unit with at least one beam for inputting energy into the building material in accordance with a set of energy input parameters;
• directing the at least one beam to a build surface;
• providing a supply of the building material;
• providing a recoater device that applies the building material over a build area for at least one of the layers;
• and
• accessing computer-based data model having data of a number of portions of an object to be manufactured in which a region to be solidified is divided into at least a first partial region and at least a second partial region,
• wherein the data model specifies a first set of energy input parameters for both the at least first partial region and the at least second partial region, the first set of energy input parameters effecting a solidification scanning that solidifies the building material at positions in the region to be solidified and specifying a second set of energy input parameters for a repetition scanning at positions of the at least second partial region, however not at positions of the at least first partial region, wherein the second set of energy input parameters is set such that a temperature of the building material within an area of incidence of the at least one beam on the building material lies above a melting point of the building material that was solidified by the solidification scanning;
• performing the solidification scanning that solidifies the building material at positions of the at least first partial region and the at least second partial region by the energy input unit, and performing the repetition scanning at the positions of the at least second partial region by the energy input unit, however not at positions of the at least first partial region,
• wherein the solidification scanning is performed prior to the repetition scanning and without new building material being applied between the solidification scanning and the repetition scanning during manufacturing of the three-dimensional objects, and
• wherein the at least second partial region comprises those positions of the region to be solidified that are solidified last in the solidification scanning, or wherein the at least first partial region comprises a contour of the respective object cross-section and the at least second partial region comprises an inside of the respective object cross-section located within the contour, or wherein the at least second partial region comprises a predefined distinguished portion of an object for which a minimum value of a mechanical parameter for a completed object is specified.

An additive manufacturing method for manufacturing one or more three-dimensional objects in a single build operation by applying a building material containing plastic in a layer by layer manner where the layers correspond to respective cross sections of one or more of the three dimensional objects that are built by solidifying the building material by supplying radiation energy to positions in each layer that are assigned to the respective cross-sections, the method comprising:

• providing an energy input unit with at least one beam for inputting energy into the building material in accordance with a set of energy input parameters;
• directing the at least one beam to a build surface;
• providing a supply of the building material;
• providing a recoater device that applies the building material in a build area for at least one of the layers;
• wherein for at least one layer of the building material, a region to be solidified within the respective layer is divided into a first partial region and a second partial region;
• and
• wherein the method comprises a solidification scanning of the building material at positions of both the first partial region and the second partial region by inputting energy into the building material in accordance with a first set of energy input parameters, and a repetition scanning at the positions of the second partial region, however not at positions of the first partial region, by inputting energy into the building material in accordance with a second set of energy input parameters, wherein the second set of energy input parameters is set such that a temperature of the building material within an area of incidence of the at least one beam on the building material lies above a melting point of the building material that was solidified by the solidification scanning;
• wherein a sequence of scanning is such that the solidification scanning is performed prior to the repetition scanning and without new building material being applied between the solidification scanning and the repetition scanning during manufacturing of the one or more three-dimensional objects;
• and
• wherein the at least second partial region comprises those positions of the region to be solidified that are solidified last in the solidification scanning, or wherein the at least first partial region comprises a contour of the respective object cross-section and the at least second partial region comprises an inside of the respective object cross-section located within the contour, or wherein the at least second partial region comprises a predefined distinguished portion of an object for which a minimum value of a mechanical parameter for a completed object is specified.