Abstract: In one example in accordance with the present disclosure, a refill container is described. The refill container includes a reservoir to house a volume of print compound and a chamber to house a pressurized fluid. A wall separates the reservoir from the chamber. A pressure release device of the refill container creates a fluid path between the chamber and the reservoir such that the pressurized fluid flows into the reservoir to mix with the volume of print compound. A trigger of the refill container activates the pressure release device.

Abstract: In some examples, a computing device can include a processing resource and a memory resource storing instructions to cause the processing resource to receive an authentication signal from an imaging device, authenticate the imaging device using the authentication signal, and transmit print enablement data to the imaging device to enable print job functionality for the imaging device in response to authenticating the authentication signal.

Abstract: An example method comprises setting a mixture of a plurality of print supplies of a print device to use for a process black print based on a plurality of supply levels corresponding to the plurality of print supplies. The example method further comprises initiating execution of the process black print of a print job by the print device using the set mixture of the plurality of print supply as overlapping colorant with the black print supply of the print device.

Abstract: In some examples, a computing device can include a processing resource and a memory resource storing instructions to cause the processing resource to determine, via an input, whether to sustainably process a print component associated with a printing device, determine, in response to a determination to sustainably process the print component a processing mechanism for the print component and a shipping location to ship the print component, and generate a shipping label for the print component associated with the shipping location.

Abstract: An example method comprises identifying a plurality of supply levels corresponding to a set of print supplies of a print device. The example method further comprises coordinating depletion of the set of print supplies by selecting between black print and process black print for a print job of the print device based on the plurality of supply levels.

Abstract: An example method comprises identifying a plurality of supply levels corresponding to a plurality of print supplies of a print device, and adjusting a color for a region of a print job for the print device based on the plurality of supply levels. The method further comprises initiating execution of the print job using the adjusted color for the region.

Abstract: An example print apparatus is described as including a fuser roller, a pressure device that generates wear on a section of the fuser roller surface, and a wear detection engine that identifies a degree of wear on the surface of the fuser roller. An example fuser roller may include a tube, a heating element, and a plurality of layers having a detectable pattern. An example print apparatus may include a wear detection engine having an emitter, a detector, and a controller that identifies a wear pattern based on data provided by the detector in response to activation of the emitter and determines a degree of wear based on the identified wear pattern.

Abstract: According to examples, an apparatus may include a processor and a memory on which are stored computer-readable instructions that, when executed by the processor, may cause the processor to determine a property of dust based on information associated with the dust in a printing device. The processor may classify the dust according to the determined property of the dust and may determine a predicted failure mode associated with the dust classification. The processor may output an instruction associated with the predicted failure mode.

Abstract: Examples described herein relate to a print substance container consistent with the disclosure. For instance, the print substance container may comprise a print substance disposed inside of the print substance container and a first electromagnet formed of a wire coil positioned around the print substance container and extending along a length of the print substance container.

Abstract: A print material cartridge may include a hopper to maintain an amount of print material therein; and an atmospheric pressure seal to seal the hopper from atmosphere; wherein a pressure within the hopper and sealed by the atmospheric pressure seal is lower than atmosphere.

Abstract: In some examples, a non-transitory machine-readable storage medium having stored thereon machine-readable instructions to cause a processing resource to: detect an alteration of a print drive assembly, alter a state of a first drive motor associated with the print drive assembly based the detected alteration of the print drive assembly, and alter a state of a drive axis associated with the print drive assembly based on the detected alteration of the print drive assembly.

Abstract: In one example in accordance with the present disclosure, a refill container is described. The refill container includes a reservoir to house a volume of print compound and a chamber to house a pressurized fluid. A wall separates the reservoir from the chamber. A pressure release device of the refill container creates a fluid path between the chamber and the reservoir such that the pressurized fluid flows into the reservoir to mix with the volume of print compound. A trigger of the refill container activates the pressure release device.

Abstract: An example print apparatus is described as including a fuser roller, a pressure device that generates wear on a section of the fuser roller surface, and a wear detection engine that identifies a degree of wear on the surface of the fuser roller. An example fuser roller may include a tube, a heating element, and a plurality of layers having a detectable pattern. An example print apparatus may include a wear detection engine having an emitter, a detector, and a controller that identifies a wear pattern based on data provided by the detector in response to activation of the emitter and determines a degree of wear based on the identified wear pattern.

Abstract: An example print component includes a container interface with a guide feature to guide rotation and a rotationally asymmetric key feature. An example toner component includes a recess to receive a toner container, a guide feature to guide rotation of the toner container, and an asymmetric key feature embedded in the guide feature to guide a container material interface towards a component material interface upon rotation. An example container may have a periphery with a rotationally asymmetric surface plane to guide rotation of the container and a protrusion extending from the periphery that has a key feature defined by edges rotationally asymmetric with respect to the periphery. An example container may include a mechanical interface including an asymmetrically-located key feature that, upon rotation of the print material container, generates a sealing force substantially perpendicular to the direction of rotation.

Abstract: An example print component includes a container interface with a guide feature to guide rotation and a rotationally asymmetric key feature. An example toner component includes a recess to receive a toner container, a guide feature to guide rotation of the toner container, and an asymmetric key feature embedded in the guide feature to guide a container material interface towards a component material interface upon rotation. An example container may have a periphery with a rotationally asymmetric surface plane to guide rotation of the container and a protrusion extending from the periphery that has a key feature defined by edges rotationally asymmetric with respect to the periphery. An example container may include a mechanical interface including an asymmetrically-located key feature that, upon rotation of the print material container, generates a sealing force substantially perpendicular to the direction of rotation.

Abstract: In some examples, a print material particles container can include a print material reservoir, a structure adapted to decrease a volume of the print material reservoir to provide an output of print material particles, and a pressure manipulation device adapted to be manipulated while the volume adapting structure is moved from a first position to a third position to aerate the print material particles.

Abstract: Examples described herein relate to a print substance container consistent with the disclosure. For instance, the print substance container may comprise a print substance disposed inside of the print substance container and a first electromagnet formed of a wire coil positioned around the print substance container and extending along a length of the print substance container.

Abstract: Methods and materials as may be utilized to provide consistent contamination testing of surfaces are described. The methods are based upon the designation of particular test zones on surfaces at risk of contamination by infectious agents. The designated test zone(s) can be tested and monitored over time and/or across like materials or devices for contamination. Templates for use in designating consistent test zones on high-touch surfaces are also described.