Abstract: A reagent dispensing system, in an example, may include a processing device, a data storage device coupled to the processing device, a plurality of swappable reagent modules, each swappable reagent module comprising a plurality of reagent dispensing cartridges, and a module frame coupling the reagent cartridges to one another.

Abstract: A cassette may include, in an example, a substrate, a die coupled to the substrate, and a reservoir defined in the substrate exposing a proximal side of the die to an external atmosphere wherein at least a portion of the die is proud relative to at least one surface of the substrate.

Abstract: A cassette may include a substrate, a die coupled to the substrate, a reservoir defined in a first side of the substrate exposing a proximal side of the die to an external atmosphere, and an overflow reservoir defined in the first side of the substrate and surrounding at least a portion of a perimeter of the reservoir.

Abstract: A reagent dispensing system may, in an example, include a processing device, a memory device coupled to the processing device, and a plurality of swappable reagent dispensing cartridges wherein a first set of the swappable reagent dispensing cartridges are maintained within a storage device off-line from a second set of swappable reagent dispensing cartridges maintained in-line.

Abstract: An example printhead assembly includes a housing, nozzles and a collapsible container within the housing to supply ink to the nozzles. The collapsible container includes a top wall, a bottom wall, first and second side walls that form an interior and a spring assembly within the interior. The first flexible wall includes a first amount of excess material. The second flexible wall includes a second amount of excess material less than the first amount of excess material such that motion of the first flexible wall of the collapsible container is constrained against movement to a lesser extent as compared to the second flexible wall. The first flexible wall faces the sensor. A sensor assembly is coupled to the housing and includes a sensor to provide a sensor signal indicating the amount of ink within the collapsible container.

Abstract: One example of a printhead assembly includes a housing including sidewalls, nozzles to eject ink drops, a collapsible container, and a sensor assembly. The collapsible container is within the housing to supply ink to the nozzles. The collapsible container includes flexible sidewalls and a spring assembly between the flexible sidewalls. The sensor assembly is coupled to the housing and includes a sensor to provide a sensor signal indicating the amount of ink within the collapsible container.

Abstract: A fluid ejection device may include a blank cassette that includes a substrate, a die coupled to the substrate, a number of assigned electrical traces formed on the substrate, and a number of unassigned electrical traces formed on the substrate. At least one wirebond may couple at least one of the unassigned electrical traces to the die thereby assigning at least one function to the fluid ejection device.

Abstract: One example of a printhead assembly includes a housing including sidewalls, nozzles to eject ink drops, a collapsible container, and a sensor assembly. The collapsible container is within the housing to supply ink to the nozzles. The collapsible container includes flexible sidewalls and a spring assembly between the flexible sidewalls. The sensor assembly is coupled to the housing and includes a sensor to provide a sensor signal indicating the amount of ink within the collapsible container.

Abstract: A cassette may include a substrate, a die coupled to the substrate, a reservoir defined in a first side of the substrate exposing a proximal side of the die to an external atmosphere, and an overflow reservoir defined in the first side of the substrate and surrounding at least a portion of a perimeter of the reservoir.

Abstract: A slot extender includes a reservoir. The reservoir includes a reservoir floor defining a drain opening, a continuous reservoir sidewall extending from the reservoir floor, and a concave fillet running along at least a portion where the reservoir sidewall joins the reservoir floor. The concave fillet has a variable radius.

Abstract: A slot extender includes a reservoir. The reservoir includes a reservoir floor defining a drain opening, a continuous reservoir sidewall extending from the reservoir floor, and a concave fillet running along at least a portion where the reservoir sidewall joins the reservoir floor. The concave fillet has a variable radius.

Abstract: A slot extender includes a reservoir. The reservoir includes a reservoir floor defining a drain opening, a continuous reservoir sidewall extending from the reservoir floor, and a concave fillet running along at least a portion where the reservoir sidewall joins the reservoir floor. The concave fillet has a variable radius.

Abstract: A slot extender includes a reservoir. The reservoir includes a reservoir floor defining a drain opening, a continuous reservoir sidewall extending from the reservoir floor, and a concave fillet running along at least a portion where the reservoir sidewall joins the reservoir floor. The concave fillet has a variable radius.

Abstract: A liquid dispenser cassette includes a frame, dispense head assemblies, and a one-piece integrated slot extender. The frame defines openings. The dispense head assemblies are mounted on the frame. The dispense head assemblies include dispense head dies at least partially exposed through the corresponding openings. The dispense head dies defines top slots. The slot extender is mounted on the dispense head assemblies. The slot extender has reservoirs defining drain openings mated to the corresponding top slots.