Abstract: Systems and methods for calculating a time duration and an amount of material consumption required for printing a tray of one or more three-dimensional objects using a three-dimensional printing system are disclosed.

Abstract: A method for producing a three-dimensional model via additive manufacturing includes building a green block in a layerwise manner with a powder material and a solidifiable non-powder material. The green block includes a green usable model. The solidified non-powder material is removed from the green block to extract the green usable model from the green block and the density of the green usable model is increased by applying Cold Isostatic Pressing (CIP). The green usable model is then sintered to produce a three-dimensional model.

Abstract: A method for preserving the shape of an object during sintering includes filling at least one volume defined by a surface of the object with a plurality of balls, sintering the object together with the balls and separating the object from the balls post sintering. The balls have a diameter of 0.5 mm-12 mm.

Abstract: A method for sintering objects formed with aluminum powder includes forming a shape of an object with aluminum powder, selecting a sintering atmosphere and sintering the object in the sintering atmosphere. The sintering atmosphere includes Nitrogen and one or more of Argon and partial vacuum. The selection is based on a desired balance of degree of shrinkage and mechanical properties to be achieved.

Abstract: A waste curing device to cure waste generated by an additive manufacturing system, the waste curing device comprising: a container for receiving the waste; a movable cover positioned above the container; one or more waste nozzles mounted on the moveable cover and configured to deliver waste into the container; a static cover positioned above the container and below the movable cover; one or more curing sources mounted on the static cover and configured to provide curing radiation to cure the waste in the container; wherein the movable cover is configured to move relative to the static cover to provide an open position for the waste nozzles to deliver waste into the container, and subsequently to a closed position, to shield the waste nozzles from curing radiation.

Abstract: Methods of fabricating three-dimensional rubber-like objects which utilize one or more modeling material formulations which comprise an elastomeric curable material and silica particles are provided. Objects made of the modeling material formulations and featuring improved mechanical properties are also provided.

Abstract: A method of additive manufacturing (AM) includes dispensing a first building material formulation to form an outer region, and dispensing a second building material formulation to form an inner region, the outer region surrounding the inner region, the inner and outer regions being shaped to form a layer of the object; exposing the layer to a first curing condition, repeating the dispensing and the exposing to sequentially form a plurality of layers of the object and collectively exposing the plurality of layers to a second curing condition. The selections are such that the first building material formulation is hardened to a higher degree than the second building formulation. The outer regions form a hardened coating that at least partially encapsulates the inner regions. The second curing condition is other than the first curing condition and is selected to increase the degree that the inner region is hardened.

Abstract: Modeling material formulations usable for forming a polyurea material in additive manufacturing, and methods for additive manufacturing of three-dimensional objects made of these formulations are provided. The modeling material formulation comprises at least one isocyanate-containing material and at least one amine-containing material such that at least one isocyanate-containing material comprises at least one polyisocyanate material and at least one amine-containing material comprises at least one aromatic polyamine material.

Abstract: An additive manufacturing method for printing an object includes receiving three-dimensional printing data corresponding to the object, defining an internal region of the object to be formed with a structured air pocket and printing the object with an additive manufacturing system. The object includes an internal region formed with a structured air pocket.

Abstract: A method of fabricating an object in layers, comprises, for at least one layer: dispensing a building material formulation to form a first portion of the layer, and leveling the first portion by a leveling device; increasing a vertical distance between the first portion and the leveling device; and while a topmost surface of the first portion is exposed and beneath a segment of the leveling device: dispensing a building material formulation to form a second portion of the layer, laterally displaced from the first portion along an indexing direction, and leveling the second portion by the leveling device.

Abstract: A system for maintaining a desired pressure difference between a first pressure within a chamber and a reference pressure at a reference space. The system may include a peristaltic pump located along a duct that connects the chamber with the reference space. The system may further include a pressure sensor for monitoring an actual pressure difference between the first pressure within the chamber and the reference pressure at the reference space. The system may also include a controller for receiving a signal from the pressure sensor for determining the actual pressure difference from the pressure sensor and for operating the peristaltic pump, in accordance with the actual pressure difference and the desired pressure difference, to increase, decrease or leave unchanged the pressure within the chamber so as to maintain the actual pressure difference within predetermined proximity to the desired pressure difference.

Abstract: Formulations usable in additive manufacturing such as 3D inkjet printing which provide a transparent material when hardened, are provided. The formulation are designed so as to provide transparent objects or parts thereof with improved transmittance and color properties such as yellowness index, compared to commercially available formulations. The formulations comprise a photoinitiator at a relatively low amount and designed mixture of curable materials.

Abstract: Methods of fabricating three-dimensional rubber-like objects which utilize one or more modeling material formulations which comprise an elastomeric curable material and silica particles are provided. Objects made of the modeling material formulations and featuring improved mechanical properties are also provided.

Abstract: A waste curing device to cure waste generated by an additive manufacturing system, the waste curing device comprising: a container for receiving the waste; a movable cover positioned above the container; one or more waste nozzles mounted on the moveable cover and configured to deliver waste into the container; a static cover positioned above the container and below the movable cover; one or more curing sources mounted on the static cover and configured to provide curing radiation to cure the waste in the container; wherein the movable cover is configured to move relative to the static cover to provide an open position for the waste nozzles to deliver waste into the container, and subsequently to a closed position, to shield the waste nozzles from curing radiation.

Abstract: A formulation system usable in additive manufacturing of a three-dimensional object that comprises, in at least a portion thereof, a cyanate ester-containing polymeric network, and additive manufacturing processes employing the formulation system are provided. Also provided are objects obtainable by the additive manufacturing and kits containing the formulation system. The formulation system includes a first modeling material formulation which includes a first curable material which is a thermally-curable cyanate ester and a second modeling material formulation which comprises an activating agent for promoting polymerization of the cyanate ester and is devoid of the first curable material, and further includes a second curable material which is different from the first curable material, and optionally an agent for promoting hardening of the second curable material.

Abstract: Formulations usable in additive manufacturing of a three-dimensional object, which comprise a reinforcing material such as silica particles in an amount of from 10 to 30%, or from 15 to 20%, by weight, of the total weight of the formulation, and a designed combination of curable materials as described in the specification, is provided. Additive manufacturing of three-dimensional objects made of such a formulation and featuring enhanced mechanical properties, and objects obtained thereby are also provided.

Abstract: A method of additive manufacturing of a three-dimensional object, comprises: sequentially dispensing and solidifying layers to form on a surface a sacrificial structure. In embodiments the sacrificial structure comprises a bulk volume and heating cells embedded in the bulk volume, where the heating cells release more heat than the bulk volume upon the solidification of the layers. In embodiments, the sacrificial structure comprises pinning structures embedded in the bulk volume. The method also comprises sequentially dispensing and solidifying layers to form the three-dimensional object on a portion of the sacrificial structure.

Abstract: A method of layerwise solid freeform fabrication is disclosed. The method comprises, for each of at least a few of the layers, dispensing and hardening at least a first modeling material and a second modeling material to form a core region and one or more envelope regions at least partially surrounding the core region. In some embodiments, the ratio between the elastic moduli of adjacent regions, when hardened, is from about 1 to about 20.

Abstract: A formulation usable in additive manufacturing of a three-dimensional object is provided. The formulation comprises one or more monofunctional curable material(s); one or more hydrophilic multifunctional curable material(s); and one or more water-miscible non-curable material(s), such that a total amount of the curable materials is 20% or less, by weight, and a weight ratio of a total weight of the monofunctional curable material(s) and a total weight of the hydrophilic multifunctional curable material(s) ranges from 1:1 to 10:1. The formulation features, when hardened, properties of a weak and flowable gel. Additive manufacturing processes utilizing the formulation as a support material formulation are also provided.