Additive manufacturing apparatuses are disclosed. In one embodiment, an additive manufacturing apparatus may comprise a support chassis including a print bay, a build bay, and a material supply bay. Each bay may comprise an upper compartment and a lower compartment. A working surface may separate each of the print bay, the build bay, and the material supply bay into the upper compartment and the lower compartment, wherein: the build bay may be disposed between the print bay and the material supply bay. The lower compartment of the build bay comprises bulkheads sealing the lower compartment of the build bay from the lower compartment of the print bay and the lower compartment of the material supply bay.

A method of operating an apparatus (10) for producing a three-dimensional work piece (18) by irradiating layers of a raw material powder with electromagnetic or particle radiation comprises the steps of a) applying a layer of raw material powder onto a carrier (12); b) selectively irradiating the layer of raw material powder with electromagnetic or particle radiation in accordance with a geometry of a corresponding layer of the work piece (18) to be produced; and c) repeating steps a) and b) until the work piece (18) has reached the desired shape and size. For at least a portion of at least some of the layers, a scanning time (t.sub.s) from the beginning of the exposure of a respective raw material powder layer portion to electromagnetic or particle radiation until the beginning of the exposure of a new raw material powder layer applied on top of said layer portion to electromagnetic or particle radiation is controlled so as to not fall below a specific minimum value which is individually set for said layer portion in dependence on a layer portion specific quality parameter. layer portion specific quality parameter

A method of operating an apparatus (10) for producing a three-dimensional work piece (18) by irradiating layers of a raw material powder with electromagnetic or particle radiation comprises the steps of a) applying a layer of raw material powder onto a carrier (12); b) selectively irradiating the layer of raw material powder with electromagnetic or particle radiation in accordance with a geometry of a corresponding layer of the work piece (18) to be produced; and c) repeating steps a) and b) until the work piece (18) has reached the desired shape and size. For at least a portion of at least some of the layers, a scanning time (t.sub.s) from the beginning of the exposure of a respective raw material powder layer portion to electromagnetic or particle radiation until the beginning of the exposure of a new raw material powder layer applied on top of said layer portion to electromagnetic or particle radiation is controlled so as to not fall below a specific minimum value which is individually set for said layer portion in dependence on a layer portion specific quality parameter. layer portion specific quality parameter

A lamination molding apparatus which can improve the lamination molding accuracy, is provided. A lamination molding apparatus, including a chamber covering a desired molding region, the chamber being filled with an inert gas of a predetermined concentration; and a molding table provided in the molding region, the molding table being configured so as to be capable of being moved vertically by a driving mechanism; wherein the molding table is configured to be temperature-controllable; and a thermostatic section is provided in between the molding table and the driving mechanism or in the driving mechanism, temperature of the thermostatic section being maintained substantially constant, is provided.

A lamination molding apparatus which can improve the lamination molding accuracy, is provided. A lamination molding apparatus, including a chamber covering a desired molding region, the chamber being filled with an inert gas of a predetermined concentration; and a molding table provided in the molding region, the molding table being configured so as to be capable of being moved vertically by a driving mechanism; wherein the molding table is configured to be temperature-controllable; and a thermostatic section is provided in between the molding table and the driving mechanism or in the driving mechanism, temperature of the thermostatic section being maintained substantially constant, is provided.

A three-dimensional (3-D) printer includes build and support material development stations positioned to transfer layers of build and support materials to an intermediate transfer surface. A platen having a flat surface is positioned to contact the intermediate transfer surface. The intermediate transfer surface transfers a layer of the build and support materials to the flat surface of the platen as the platen contacts one of the layers on the intermediate transfer surface. A dispenser is positioned to deposit a leveling material on the layer on the platen, and a mechanical planer is positioned to contact and level the leveling material on the layer on the platen to make the top of the leveling material parallel to the flat surface of the platen.

A metallic filter (1) includes a microstructured architecture (2) defined in a three-dimensional space having orthogonal axes, microstructured architecture (2) includes a metallic network (10) formed by a plurality of longitudinal connecting strands (12), namely extending along a longitudinal axis direction (X), and a network (20) of pores formed of a plurality of longitudinal interstices (22) located along connecting strands (12). Each longitudinal interstice corresponding to a subset of pores (24) of the network (20) of pores. The subset of pores (24) for which the pores are aligned along the longitudinal axis (X), the longitudinal interstices (22) thereby defining an axis of anisotropy of the microstructured architecture.

A metallic filter (1) includes a microstructured architecture (2) defined in a three-dimensional space having orthogonal axes, microstructured architecture (2) includes a metallic network (10) formed by a plurality of longitudinal connecting strands (12), namely extending along a longitudinal axis direction (X), and a network (20) of pores formed of a plurality of longitudinal interstices (22) located along connecting strands (12). Each longitudinal interstice corresponding to a subset of pores (24) of the network (20) of pores. The subset of pores (24) for which the pores are aligned along the longitudinal axis (X), the longitudinal interstices (22) thereby defining an axis of anisotropy of the microstructured architecture.

A method and an apparatus of a powder bed fusion additive manufacturing system that enables a quick change in the optical beam delivery size and intensity across locations of a print surface for different powdered materials while ensuring high availability of the system. A dynamic optical assembly containing a set of lens assemblies of different magnification ratios and a mechanical assembly may change the magnification ratios as needed. The dynamic optical assembly may include a transitional and rotational position control of the optics to minimize variations of the optical beam sizes across the print surface.

A stereolithographic apparatus has a machine body disposed with a swept platform, which has a recess formed by recessing into a circumference of the swept platform. A build platform driven by the linear actuator to move is aligned with and abuts against a recess. A motor and a light-emitting device are disposed in the machine body. The motor drives a recoating blade to sweep on the swept platform and the build platform. By rotating the recoating blade, the slurry material could circularly spread the slurry material onto the build platform to form multiple build layers. After each build layer is spread, the light-emitting device irradiates the build layer to partially cure the build layer to form a build layer. By repeating the aforementioned process, the build layers are formed to pile as a printed product (e.g. green body), thereby rapidly producing a delicate product without supporting structure.