Abstract: In an example implementation, a method of compensating for dimensional variation in 3D printing includes receiving a voxel space model that represents a 3D object to be printed within a build volume of a 3D printing system, asymmetrically eroding voxels from the voxel space model, and printing the 3D object based on the asymmetrically eroded voxel space model.

Abstract: According to examples, an apparatus may include a processor and a memory on which are stored machine-readable instructions that when executed by the processor, may cause the processor to identify a property of a portion of a three-dimensional (3D) part to be fabricated and determine, based on the identified property, a thermal value associated with the portion. The instructions may also cause the processor to, based on the determined thermal value, determine a first agent composition to be used to fabricate the portion and determine a second agent composition to be used to fabricate a section external and adjacent to the portion, in which the first agent composition and the second agent composition may be determined to cause the portion and the external section to be fabricated to have the identified property while maintaining the external section separate from the portion.

Abstract: In an example, a method includes receiving, at a processor, a data comprising a model of an object to be generated in additive manufacturing. The data comprises object model data representing an object model as a plurality of initial polygons and object property data associated with the initial polygons. The method may comprise generating a representation of a slice of the object model defined between two planes and generating a plurality of polygons to represent the slice of the object model. A mapping between the object property data and the generated plurality of polygons may also be generated.

Abstract: Systems, methods, and computer-readable storage media for locking-in currency exchanges. One method includes providing, by a graphical user interface (GUI) of a wallet application, a customer request, wherein the customer request is a request for a currency transfer between a customer account of the customer to a recipient account of a recipient, wherein the customer account is associated with a first type of currency and the recipient account is associated with a second type of currency, presenting, by the GUI of the wallet application, a locked-in exchange rate for a time limit and data corresponding to the exchange rate and the time limit, exchanging, by the wallet application, an amount of the first type of currency for an amount of the second type of currency based on the exchange rate, and receiving, by the GUI of the wallet application, an indication of a transferred amount for a currency transfer.

Abstract: In an example, a method include receiving a data model of an object to be generated in additive manufacturing at a processor, the data model comprising object property data. A segmentation of a virtual build volume comprising at least a portion of the object into a plurality of nested segments may be derived. A first segment may be associated with first object generation parameters and a second segment may be associated with second, different, object generation parameters. A number of nested segments to be derived may be determined based on at least one of a geometry of the object and an intended object property.

Abstract: In some examples, an additive manufacturing system includes a dispensing device, an applicator, a thermal energy source, a thermal imaging device, and a controller. The controller is to cause the dispensing device to deposit a layer of build material and cause the applicator to apply the fusing agent to form an object portion and to apply the detailing agent to form a reference portion in the layer of build material. The controller is to cause the thermal energy source to heat the reference portion and to heat and fuse the object portion and cause the thermal imaging device to measure a temperature of the reference portion. The controller is to regulate a power level of the thermal energy source based on a comparison between the temperature of the reference portion and a set-point for the reference portion, which is based on a target temperature for the object portion.

Abstract: According to examples, an apparatus may include a processor that may access information about a screen device having pores, in which the screen device is to be employed to filter liquid from a slurry composed of the liquid and material elements to form a part from the material elements. The processor may also access information about a main body, in which the main body is to support the screen device during formation of the part and has a plurality of openings that are larger than the pores in the screen device. The processor may identify, based on relative locations of the pores and the openings, pores that are to be removed from the screen device to increase uniformity of liquid flow through the pores across the screen device and may modify the accessed information about the screen device to remove the identified pores from the screen device.

Abstract: A control system for a three-dimensional printer includes an energy component interface, an agent depositing component interface, and control logic. The control logic controls the operation of an energy component through the energy component interface and an agent depositing component through the agent depositing component, in forming an output object that is specified in a print job. Additionally, in some examples, the control logic can implement a plurality of modes. Each mode, when selected modulate one or more operational parameters of a least one of the energy component or agent depositing component.

Abstract: Systems, methods, and computer-readable storage media for locking-in currency exchanges. One method includes providing, by a graphical user interface (GUI) of a wallet application, a customer request, wherein the customer request is a request for a currency transfer between a customer account of the customer to a recipient account of a recipient, wherein the customer account is associated with a first type of currency and the recipient account is associated with a second type of currency, presenting, by the GUI of the wallet application, a locked-in exchange rate for a time limit and data corresponding to the exchange rate and the time limit, exchanging, by the wallet application, an amount of the first type of currency for an amount of the second type of currency based on the exchange rate, and receiving, by the GUI of the wallet application, an indication of a transferred amount for a currency transfer.

Abstract: In one example, a fusing system for an additive manufacturing machine includes a first carriage carrying a layering device and a fusing lamp, and a second carriage carrying a fusing agent dispenser. The first carriage and the second carriage are movable back and forth over the work area along the same line of motion so that the first carriage follows the second carriage in one direction and the second carriage follows the first carriage in the other direction.

Abstract: In an example implementation, a method of printing a three-dimensional (3D) object includes scanning a print bar in a first direction over a build platform of a 3D printer to deposit a liquid agent onto a layer of build powder. The print bar is then indexed in a second direction substantially orthogonal to the first direction before scanning the print bar back over the build platform in a third direction opposite the first direction to deposit additional liquid agent onto the layer of build powder.

Abstract: According to examples, an apparatus may include a processor that may access a digital model of an item to be fabricated to have a plurality of features, in which the digital model may include a surface. The processor may pack a plurality of digital ellipsoids to intersect the surface of the digital model of the item, in which the plurality of digital ellipsoids are arranged with respect to each other based on a curvature of the surface. The processor may also determine locations on the surface at which the plurality of digital ellipsoids intersect the surface and may set the determined locations as points on the surface at which the plurality of features are to be formed.

Abstract: Systems, methods, and computer-readable storage media utilized receiving a customer request via a graphical user interface (GUI) of a wallet application, extracting transfer information from the customer request based on a smart contract and identifying the transfer information in predefined fields, determining the customer account is associated with a first type of currency and the recipient account is associated with a second type of currency, automatically determining and locking-in an exchange rate, transmitting data corresponding to the exchange rate to the GUI, exchanging an amount of the first type of currency for an amount of the second type of currency based on the exchange rate, transferring an amount for the currency transfer from the wallet application to the recipient account via an omnibus account based on executing a smart contract on a distributed ledger, and transmitting a confirmation of the currency transfer to the GUI of the wallet application.

Abstract: A system for presenting a soft-proof of a three-dimensional (3D) printed part may include a processor, and a memory device communicatively coupled to the processor. The system may also include a communication link to support communication with a 3D printing device, and computer usable program code to, when executed by the processor, retrieve data from the 3D printing device defining at least one capability of the 3D printing device that affects an appearance of a part when printed. The system may also include an application programming interface (API) to provide data defining generation of a soft-proof of the part based on the at least one capability of the 3D printing device, the soft-proof of the part depicting characteristics of the part as the part appears as printed.

Abstract: In an example, a method includes receiving object model data describing at least a portion of an object to be generated by additive manufacturing. Object generation instructions for generating the object in its entirety may be derived based on the object model data. Where it is determined that the object model data comprises a data deficiency for deriving the object generation instructions, at least one attribute for the object may be inferred and object generation instructions may be derived based on the object model data and the inferred attribute.

Abstract: In an example, a method includes acquiring, at a processor, a data model of an object to be generated in additive manufacturing, the data model comprising object model data representing a slice of the object model as a plurality of polygons and object property data comprising property data associated with the plurality of polygons. The slice may be inspected from a predetermined perspective at a plurality of discrete locations. It may be determined if each location is within a face of a polygon, and if so, the object property data associated with that polygon may be identified and associated with that location. The slice may further be inspected at a plurality of discrete locations along an edge of a polygon, the object property data associated with each location may be identified and associated with that location.

Abstract: In an example, a method includes receiving, at least one processor, a mesh model for an object, a first transformation matrix to apply to the mesh model to describe a first object for generation in additive manufacturing and a second transformation matrix to apply to the mesh model to describe a second object for generation in additive manufacturing. The method may further include determining, by at least one processor, if the first and second transformation matrices describe transformations which are equivalent in terms of mesh errors and, if so, inspecting the mesh model for mesh errors once for both the first and second transformation matrices.

Abstract: According to examples, an apparatus may include a processor and a memory on which are stored machine-readable instructions that when executed by the processor, may cause the processor to identify an orientation of a surface of a three-dimensional (3D) model. The instructions may also cause the processor to, based on the identified orientation of the surface, determine an agent formulation to be employed in fabricating a section of a 3D printed part corresponding to the surface, in which each of a plurality of different orientations of surfaces of the 3D model corresponds to a respective different agent formulation.

Abstract: Systems and method relating to a distributed ledger currency rail are provided. A computer-implemented method includes receiving a funds transfer request message including an amount, a sender, and a recipient; examining the funds transfer request message to identify a sending financial institution associated with the sender and a receiving financial institution associated with the recipient; and determining whether the sending financial institution and the receiving financial institution each operates a node on a permissioned distributed ledger network.