Abstract: The present disclosure is drawn to food contact compliant three-dimensional printing kits, materials, compositions, systems, and methods. In some examples, described herein is an example of a multi-fluid kit for three-dimensional printing comprising: a food contact compliant fusing agent comprising: at least about 70 wt % water based on the total weight of the food contact compliant fusing agent, food contact compliant carbon black dispersion in an amount of from about 3 wt % to about 10 wt % based on the total weight of the food contact compliant fusing agent, and at least one food contact compliant water soluble first co-solvent present in the food contact compliant fusing agent in an amount of from about 1 wt % to about 25 wt % based on the total weight of the food contact compliant fusing agent.

Abstract: A method comprising dividing a build model comprising an object model arranged within a virtual volume into cross-sectional layers along a vertical axis. The layers represent layers of an additive manufacturing process. A set of base layers is identified with each of the base layers comprising a flat bottom surface of the object model. A base characteristic is assigned to the set of base layers. A set of bulk layers is identified which excludes the set of base layers. A bulk characteristic is assigned to the set of bulk layers. An additive manufacturing apparatus is instructed to build a build cake according to the build model, layers and assigned characteristics, so a fluid agent is deposited at a first rate for the set of bulk layers having the bulk characteristic and a second rate, slower than the first rate, for the set of base layers having the base characteristic.

Abstract: Examples of a method for emotive avatar animation are described. Some examples of the method may include combining first user pose data captured by an external camera with second user pose data captured by a head-mounted display (HMD). Some examples of the method may include animating an emotive avatar based on the combined user pose data.

Abstract: The present disclosure refers to a method of monitoring a fluid supply system, the system including a collapsible fluid reservoir to contain a supply of fluid and an outer container to enclose the collapsible fluid reservoir and to receive pressurized gas that pressurizes the supply of fluid, the method comprising a controller to: control a gas pressure pump to feed the fluid to or from the fluid reservoir, the gas pressure pump operating in pressurization cycles; monitor a parameter of the pressurization cycles; and determine a fill state of the fluid reservoir as a function of the monitored parameter.

Abstract: A developing device includes a developer carrier to carry a developer, a conveyance path to circulate the developer and supply the developer to the developer carrier, a discharge path extending from the conveyance path and including a discharge port to discharge a portion of the developer, as excess developer, and a valve body provided between the conveyance path and the discharge port. The valve body includes an inlet side oriented toward the conveyance path and an outlet side disposed opposite the inlet side to allow a passage of the the excess developer from the conveyance path through the valve body toward the discharge port, when a pressure applied to the inlet side is greater than a pressure threshold value.

Abstract: An example system includes a policy engine to measure a local environmental characteristic and determine whether a security policy is satisfied based on the environmental characteristic. The system also includes a signature engine to generate a partial signature using a share of a shared secret based on the security policy being satisfied.

Abstract: A fluidic die may include a substrate supporting a fluid actuator address line and first and second groups of fluid actuators connected to the fluid actuator address line. The first group of fluid actuators may include first and second types of fluid actuators having different operating characteristics. The second group of fluid actuators may include the first and the second types of fluid actuators. The fluid actuators of the first and second groups have addresses such that a fluid actuator of the first type in the first group and a fluid actuator of the second type in the second group are both enabled in response to a single enabling event on the fluid actuator address line.

Abstract: An example device includes a connection engine to establish a secure connection with a second device. The device includes a security engine to determine a shared security state for the first device and the second device based on a security state of the first device and a security state of the second device. The security engine is to detect a change in the security state of the first device should occur. The security engine is to change the shared security state at the first device. The security engine is to indicate to the second device the change in the shared security state at the first device.

Abstract: A method of recovering polymer from a three-dimensional printed object can include dissolving a polyamide polymer of a three-dimensional printed object in a polyamide-dissolving solvent to generate dissolved polyamide polymer from the three-dimensional object, where the three-dimensional printed object can include a particulate fusing compound and from about 90 wt % to about 99.9 wt % of the polyamide polymer; separating the particulate fusing compound from the polyamide-dissolving solvent and the dissolved polyamide polymer; and evaporating the polyamide-dissolving solvent from the dissolved polyamide polymer.

Abstract: An example computing device including a processor, a first non-volatile memory to store a first basic input/output system (BIOS) image, a second non- volatile memory, and a controller. The controller Is to receive encrypted location and size information of the first BIOS image from the processor, verify the received encrypted location and size information of the first BIOS image, verify a signature of the first BIOS image in the first non-volatile memory, control a backup process of the first BIOS image to the second non-volatile memory, verify the signature of the backed up first BIOS image in the second non-volatile memory, and in response to a successful verification of the signature, send a message to the processor to cause the processor to perform a boot process using the first BIOS image from the first non-volatile memory.

Abstract: An example image forming apparatus includes a frame, a first shaft supported by the frame, and a first coupler. The first coupler includes a body coupled to one end of the first shaft and a first protrusion protruding from the body in an axial direction of the first shaft, the first protrusion having a first surface and a second protrusion protruding from the first surface. The second protrusion is to lock with a groove to mount a cartridge on the frame, the first shaft is to provide a rotational force in a first rotational direction to rotate the second protrusion of the first coupler and to insert the second protrusion into the groove to lock with the cartridge, and the first surface of the first protrusion of the first coupler is to contact a second surface to transmit the rotational force to the second coupler in the first rotational direction.

Abstract: Examples for servicing a computing device by a servicing agent are described. In an example, the servicing agent receives a first set of information which includes device information corresponding to the computing device. Further, the servicing agent receives a second set of information during a second session, wherein the second set of information is received through a user input and is indicative of a state of the computing device. The servicing agent further processes the first set of information and the second set of information to determine a diagnostic test. The servicing agent causes to execute the diagnostic test on the computing device.

Abstract: An example apparatus to produce a three-dimensional object comprises a controller, a build area configured to receive a layer of particulate material, a printhead, and an ultraviolet light emitting diode energy source. The controller is to cause the printhead to deposit a liquid which absorbs ultraviolet radiation onto the layer of particulate material. The controller is further to cause the ultraviolet light emitting diode energy source to irradiate the liquid, after the liquid has been deposited onto the layer of particulate material, thereby to heat the liquid and cause a portion of the particulate material to solidify.

Abstract: An authentication device receives a unique fulfillment identifier from a client device prior to payload fulfillment. The unique fulfillment identifier corresponds to a unique payload identifier of a specific payload and a unique group identifier of a group of payloads including the specific payload. The authentication device authenticates the unique payload identifier based on the unique group identifier. In response to successfully authenticating the unique payload identifier based on the unique group identifier, the authentication device transmits an indication of successful authentication of the payload to the client device.

Abstract: A printer, according to an example, includes a sensor circuit to sense a position of an element of the printer, wherein the sensor circuit includes a comparison circuit to compare a sensed signal to a threshold signal and generate an output signal based on the comparison. The printer includes a controller to: repeatedly power on and power off the sensor circuit; receive the output signal of the comparison circuit when the sensor circuit is powered on, thereby receiving a plurality of output signals over time; and adjust the threshold signal based on at least one of the plurality of output signals.

Abstract: In some examples, a non-transitory machine-readable medium stores machine-readable instructions, which, when executed by a processor, cause the processor to receive operational data of a videoconferencing solution, to predict, utilizing a machine learning process on the operational data, an incident of the videoconferencing solution, and to generate, based on the prediction, an incident alert.

Abstract: In one example in accordance with the present disclosure, an electronic device is described. The example electronic device includes a NAND flash device to store a static data component of a variable. The example electronic device also includes a NOR flash device to store a dynamic data component of the variable. The electronic device further includes a controller to write the static data component of the variable to the NAND flash device. This controller is also to write the dynamic data component of the variable to the NOR flash device.

Abstract: In an example, a method is described. The method includes receiving a color response profile associated with a first color calibration pattern printed on a first medium. The method further includes determining a drop weight ratio associated with the first medium based on a color response profile for the first medium and a color response profile associated with a reference color calibration pattern printed on a reference medium. The method further includes determining an anticipated color response profile associated with a second medium based on the drop weight ratio associated with the first medium and a pre-determined color response profile associated with the second medium.

Abstract: Examples are described herein for inline actuators. In various examples, an apparatus to operably couple a computing device with a docking station may include: a first connector to be removably attached to the computing device; a second connector to facilitate removable coupling of the apparatus with the docking station; and an inline actuator arranged between the first connector and the second connector. The inline actuator may be actuable to cause a signal to be transmitted to the docking station or the computing device. The signal may directly or indirectly cause the computing device to transition from a first power state to a second power state.

Abstract: An example method comprises operating a drive unit to advance a substrate in a substrate advance direction toward a printing station. At the printing station, a first line is printed onto the substrate. A drive unit is instructed to advance the substrate in the substrate advance direction by a target amount, and a second line is printed onto the substrate. The distance between the first and second lines in a direction perpendicular to the substrate advance direction is calculated and, based on the calculated difference, a tension of the substrate is modified.

Abstract: Disclosed herein is an adhesive belt for use in a printing device, a printing device, and a method of operating a printing device. The adhesive belt is to be placed around a conveyer belt of a printing device. The adhesive belt comprises a contact surface that is to come in contact with a print medium, wherein the contact surface comprises a dry adhesive material. The adhesive belt further comprises a fastener that is to open and close the adhesive belt by reversibly joining opposing end portions of the adhesive belt.

Abstract: The present disclosure is drawn to food contact compliant three-dimensional printing kits, materials, compositions, systems, and methods, in some examples, described herein is a food contact compliant fusing agent comprising: at least about 75 wt % water based on the total weight of the food contact compliant fusing agent, food contact compliant carbon black dispersion in an amount of from about 3 wt % to about 10 wt % based on the total weight of the food contact compliant fusing agent, at least one food contact compliant water soluble first co-solvent present in the food contact compliant fusing agent in an amount of from about 1 wt % to about 25 wt % based on the total weight of the food contact compliant fusing agent, and at least one food contact compliant pH adjuster or at least one food contact compliant liquid additive.

Abstract: Support structure generation is described in which object model data relating to a plurality of three-dimensional objects to be printed by a three-dimensional printer may be obtained. A support structure such as a grid structure for supporting the objects during post-processing of the generated objects is generated. The grid support structure comprises a base portion printable in a substantially flat orientation and a connection element for releasably connecting each object to the base portion. The base portion comprises a flexible portion to enable the base portion that is printable in a substantially flat orientation to be formed into another configuration after printing without breakage of the base portion. Each object may be positioned on the base portion via a releasable connection element. Modified model data representing both the plurality of objects and the grid support structure, for printing by the additive manufacturing system, may then be obtained.

Abstract: The present disclosure is drawn to covers for electronic, devices, methods of making the covers, and electronic devices, in one example, described herein Is a cover for an electronic device comprising: a substrate; a micro-arc oxidation layer applied on at least one surface of the substrate; and a dyeing layer on the micro-arc oxidation layer, wherein the dyeing layer comprises: from about 3 to about 10 wt% wafer based dyes based on the total weight of the dyeing layer; and from about 0.3 wt % to about 2 wt% surfactant based on the total weight of the dyeing layer.

Abstract: In an example implementation, a reagent storage system for a microfluidic device includes a microfluidic chamber formed in a microfluidic device. A blister pack to store a reagent includes an electrically conductive membrane barrier adjacent to the chamber. A thinned region is formed in the membrane barrier, and a conductive trace is to supply electric current to heat and melt the thinned region. Melting the thinned region is to cause the membrane barrier to open and release the reagent into the chamber.

Abstract: A consumable microfluidic receptacle includes a first sheet and a second sheet. The first sheet is electrically connectable to a ground element. The second sheet is spaced apart from the first plate, wherein the microfluidic receptacle is to receive a liquid droplet between the first and second sheets. The second sheet includes an exterior surface portion to receive releasable contact from an array of individually controllable electrodes of an electrode control element to produce an electric field from the second sheet to the first sheet to selectively pull the liquid droplet through the microfluidic receptacle. The second sheet comprises a conductive-resistant matrix and a plurality of conductive paths spaced apart throughout the matrix and oriented perpendicular to a plane through which second sheet extends.

Abstract: An example computing device includes a body and a first display device including a lower end that is pivotably connected to the body and a front surface including a first display area. The computing device further includes a second display device including a pivotable end that is pivotably connected to the body and a free end opposite the pivotable end. The computing device further includes a bias member connecting the second display device to the first display device. The bias member resiliently urges the free end of the second display device towards the front surface of the first display device.

Abstract: Example implementations relate to generating print job life cycles. For example, a cloud resource, can include instructions to: extract printer data associated with a print job from a printing device, extract application data associated with the print job from a computing device executing an application associated with the printing device, extract driver data associated with the print job rom a driver associated with the computing device, and generate a life cycle of the print job based on the printer data, application data, and driver data associated with the print job.

Abstract: Described herein are compositions, methods, and systems for printing metal three-dimensional objects. In an example, described is a method of printing a three-dimensional object comprising: (i) depositing a metal powder build material, wherein the metal powder build material has an average particle size of from about 10 ?m to about 250 ?m; (ii) selectively applying a binder fluid on at least a portion of the metal powder build material, wherein the binder fluid comprises an aqueous liquid vehicle and latex polymer particles dispersed in the aqueous liquid vehicle; (iii) heating the selectively applied binder fluid on the metal powder build material to a temperature of from about 40° C. to about 180° C.; and (iv) repeating (i), (ii), and (iii) at least one time to form the three-dimensional object.

Abstract: An example non-transitory machine-readable storage medium includes instructions to, when executed by the processor, capture an image of a face of a user viewing a display device, identify a light source in the image, and identify light from the display device reflecting off the face of the user. The example instructions are also executable to determine a signature of the light in the image by 1) positively weighting a light measurement from the light source in the image and 2) negatively weighting a light measurement emanating from the display device and reflecting off the face of the user. The example instructions are also executable to modify a display device setting based on the signature of the light in the image.

Abstract: In some examples, an imaging device can include a processing resource and a memory resource storing instructions to cause the processing resource to receive an operating parameter corresponding to a business model, configure the imaging device based on the received operating parameter corresponding to the business model, and operate the imaging device according to the received operating parameter.

Abstract: In an example, an apparatus is described. The apparatus comprises a memory device comprising a set of logical cells. A logical cell of the set of logical cells indicates a data value by an amount of charge stored in a physical cell of the logical cell. Charge leakage between the physical cell and an adjacent physical cell of the logical cell is to occur at a rate that at least partially depends on a relative amount of charge stored in the physical cell and the adjacent physical cell. A set of data values indicated by the set of logical cells is to change over time due to the charge leakage. The set of data values indicated by the set of logical cells is representative of information that is valid over an estimated period of time, which is based on the rate of charge leakage.

Abstract: In an example, an apparatus is described. The apparatus comprises a processor to interface with a computing system and a memory device comprising a set of logical cells. A logical cell of the set of logical cells indicates a data value by an amount of charge stored in a physical cell of the logical cell. Charge leakage between the physical cell and an adjacent physical cell of the logical cell is to occur at a rate that at least partially depends on a relative amount of charge stored in the physical cell and the adjacent physical cell. The apparatus further comprises a machine-readable medium storing instructions readable and executable by the processor to cause the processor to process a request issued via the computing system for the processor to cause a memory operation to be performed in the memory device.

Abstract: A computing device comprising a controller is disclosed herein. The controller is to receive an arrangement of a 3D object a virtual build volume to be generated by a 3D printer; determine an indication of the expected warpage of a portion of the 3D object; and modify the virtual build volume to add at least one anchor structure connected to the portion of the 3D object if the expected warpage is above a predeterminable threshold.

Abstract: In an example a method comprises receiving at a processor, a digital model representing an object to be produced by additive manufacturing. The method may comprise receiving, at the processor, a selected location on a surface of the object, where a label is to be formed. The method may further comprise defining a label displacement map associated with the selected location, applying the label displacement map to the digital model, and rendering the digital model including the label displacement map into voxels for additive manufacturing.

Abstract: In an example in accordance with the present disclosure, a system is described. The system includes a display device and a gaze tracking system to capture eye movements of a user looking at the display device. The system also includes a controller. The controller authenticates the user based on eye movements of the user matching an eye movement authentication pattern. The controller also calibrates a computing device based on the eye movements of the user.

Abstract: An example non-transitory machine-readable storage medium includes instructions to, when executed by the processor, cause the processor to detect that a local participant in a videoconference is looking at a first remote participant window of a plurality of participant windows, wherein the plurality of participant windows is displayed via the computing device and the local participant is a user of the computing device. The example instructions are also executable to capture an image of a face of the local participant based on the detection and adjust a position of an iris of the local participant from a side position to a center position. The instructions are also executable to transmit the iris position adjustment to a plurality of remote participant computing devices to change an appearance of the local participant in a participant window displayed in a first remote participant computing device of the plurality of remote participant computing devices.

Abstract: Examples relate to techniques for performing a nucleic acid amplification reaction. The method includes generating a nucleic acid solution comprising a plurality of nucleic acid molecules, and combining the nucleic acid solution with a plurality of chamber particles. Each chamber particle includes a chamber for receiving the nucleic acid solution, wherein the chamber receives, at most, one of the plurality of nucleic acid molecules. Each chamber particle also includes reagents for causing a polymerase chain reaction within the chamber. The method further includes inducing nucleic acid amplification to generate an amplified nucleic acid, and performing a detection process to detect the presence of the amplified nucleic acid within the chamber.

Abstract: The location of a printing device is determined. Environmental conditions in which the printing device operated when printing a print job are determined based on the determined location. An environmental adjustment factor for the printing device is determined based on the determined environmental conditions. A predicted print material usage of the printing device in printing the print job is adjusted based on the determined environmental adjustment factor.

Abstract: An example of a flexible sensor stack includes a flexible film comprising a conformal polymer film or a flexible glass film. The flexible sensor stack includes first and second conformal poly(3,4-ethylenedioxythiophene) (PEDOT) films formed over the flexible film and including sensor traces to provide a flexible touch/pen (T/P) sensor surface, wherein the flexible sensor stack is bendable to conform to a non-flat attachment surface.

Abstract: An example method includes providing access to a database of a plurality of print devices registered to a print system, and receiving print data that identifies a print job for a print device among the plurality of print devices and a first account for a first service of the print system. The method further includes managing the print job including applying usage data for the print job to the first account based on the print data, and applying consumption data for the print job to a second account based on the print data, the second account being associated with the print device and a second service of the print system.

Abstract: An example display device includes a panel and a controller to define a boundary between a first region of an input layer of the panel and a second region of the input layer of the panel. The example controller disables digital ink input for the first region when the first region is designated for video output and the controller enables digital ink input for the second region when the second region is designated for receiving digital ink input.

Abstract: In example implementations, an apparatus is provided. The apparatus includes a channel, a reagent chamber, a synthetic jet channel, and an energy source. The channel is to hold a cell. The reagent chamber is coupled to the channel and stores a reagent. The synthetic jet channel is coupled to the channel and the reagent chamber. The energy source is located in the synthetic jet channel to heat a liquid in the synthetic jet channel to create a synthetic jet that carries the reagent through towards the cell to inject the reagent into the cell.

Abstract: Examples of a computing device capable of switching between a low-power state and an operational state, are described. In one example, the computing device comprises a touch sensor, provided on an outer surface of a housing of the computing device. In response to a determination by the physical sensor that the computing device is in a container, the computing device may switch from an operational state to a low-power state. In another example, in response to detecting a touch by the touch sensor and a change in the physical attribute, the computing device may switch from the low-power state to the operational state.

Abstract: A height adjustment apparatus for a print carriage comprises a support for supporting the print carriage and a moving mechanism. The support has an upper support surface configured to slidingly engage a surface of the print carriage. The height of the support surface in a first direction increases in a second direction, perpendicular to the first direction. The moving mechanism is configured to move the support in the second direction, wherein when the support is moved in the second direction, the print carriage surface is configured to slide relative to the support surface to move the print carriage in the first direction.

Abstract: According to aspects of the present disclosure, there are provided methods and apparatus for providing a user characteristics determination module for use with a head-mountable display device, comprising: a biological characteristics handler to determine whether biological sensor data is indicative of a predefined biological characteristic of the user; and determination logic to determine and output a predefined response to the determined biological characteristic of the user.

Abstract: In an example of the disclosure, a first optical sensor positioned adjacent to a web path and having a first sensor beam is utilized to identify a first signal value as the first optical sensor detects an eye-mark as the web is moved along the web path. A second optical sensor positioned adjacent to the web path, downstream of the first optical sensor, and having a second sensor beam, is utilized to identify a second signal value as the second optical sensor detects the eye-mark. A lateral misalignment of the web is determined based upon the first signal value, the second signal value, and a lateral offset of the first sensor beam from the second sensor beam.

Abstract: An example system includes an array of retaining features in a microfluidic cavity, an array of thermally controlled releasing features, and a controller coupled to each releasing feature in the array of releasing feature. Each retaining feature in the array of retaining features is to position capsules at a predetermined location, the capsules having a thermally degradable shell enclosing a biological reagent therein. Each releasing feature in the array of releasing features corresponds to a retaining feature and is to selectively cause degradation of the shell of a capsule. Each releasing feature is to generate thermal energy to facilitate degradation of the shell. The controller is to selectively activate at least one releasing feature in the array of thermally controlled releasing features to release the biological reagent in the capsules positioned at the retaining feature corresponding to the activated releasing feature.

Abstract: In an example implementation according to aspects of the present disclosure, an electronic assembly comprises a chassis including a wall and a component section. The electronic assembly comprises a printed circuit board (PCB) having an inset that forms a gap between the PCB and the wall of the chassis to enable fluid to flow along the wall of the chassis from a first region of the electronic assembly located adjacent to a first side of the PCB to a second region of the electronic assembly located adjacent to a second side of the PCB. The electronic assembly also includes a fluid mover to move fluid, via the inset, from the first region of the electronic assembly to the component section located in the second region of the electronic assembly.

Abstract: Example electronic devices for detecting whether a fan of the electronic device is malfunctioning are disclosed. In an example, the electronic device includes a housing, a fan to generate an airflow within the housing, and a microphone coupled to the housing. In addition, the electronic device includes a controller coupled to the microphone and the fan. The controller is to use the microphone to record a fan noise emitted by the fan, and determine whether the fan is malfunctioning based on the fan noise.