Embodiments of the disclosed subject matter provide a device that may have a first depositor that includes one or more delivery apertures surrounded by one or more exhaust apertures, where the one or more delivery apertures and the one or more exhaust apertures are enclosed within a perimeter of a boss that protrudes from a substrate-facing side of the one or more delivery apertures. The delivery channels for the one or more delivery apertures and exhaust channels for the one or more exhaust apertures may be routed orthogonally to each other. The one or more delivery apertures may be configured to permit jets of delivery gas pass through a lower surface of the first depositor. The lower surface of the first depositor may include the one or more exhaust apertures to remove surplus vapor from a delivery zone. Embodiments may also provide a method of forming a print head.

A printing device for building material articles, comprises a tank (2) for a printing material, solid or liquid, to be dispensed, an outlet mouth (3) suitable for dispensing the printing material onto a work surface, a conduit (5) extending along its own main direction (A) between the tank (2) and the outlet mouth (3), in which the conduit (5) comprises at least one deformable wall (6) movable between an operating position, in which it determines the creation of a restriction in the conduit (5) preventing the flow of the printing material towards the outlet mouth (3), and a rest position, in which it allows the flow of the printing material towards the outlet mouth (3).

Disclosed herein is a material ejector (e.g., print head) geometry having alignment of material inlet channels in-line with microchannels, symmetrically disposed in a propellant flow, to obtain smooth, well-controlled, trajectories in a ballistic aerosol ejection implementation. Propellant (e.g., pressurized air) is supplied from above and below (or side-by-side) a microchannel array plane. Obviating sharp (e.g., 90 degree) corners permits propellant to flow smoothly from macroscopic source into the microchannels.

Embodiments of the disclosed subject matter provide methods and systems including a nozzle, a source of material to be deposited on a substrate in fluid communication with the nozzle, a delivery gas source in fluid communication with the source of material to be deposited with the nozzle, an exhaust channel disposed adjacent to the nozzle, a confinement gas source in fluid communication with the nozzle and the exhaust channel, and disposed adjacent to the exhaust channel, and an actuator to adjust a fly height separation between a deposition nozzle aperture of the nozzle and a deposition target. The adjustment of the fly height separation may stop and/or start the deposition of the material from the nozzle.

A print head includes a capillary around an axis of symmetry for a liquid to be printed, the capillary adjoining at least one elastic element and having a nozzle opening which opens into a prechamber. The prechamber has an outlet opening aligned with the nozzle opening of the capillary in its axial orientation of the axis of symmetry and at least one inlet opening for a guide gas. The at least one elastic element forms a guide for the capillary in its axial orientation only. A feed for the liquid to be printed is provided in the capillary. A mechanical oscillation system is provided that includes the at least one elastic element and the capillary with the liquid contained therein. An actuator with a mechanical or magnetic force interaction with the oscillation system is further provided.

An electrohydrodynamic print head includes a plurality of nozzles and a common electrode. Separately controllable electrostatic fields between the common electrode and each nozzle are provided. The common electrode can also shield adjacent electrostatic fields from each other. Each nozzle can be associated with separately controllable gas flow fields and separately back pressures. The print head enables simultaneous e-jet printing of different printing fluids and/or different resolutions. The print head may be part of a printing system with interchangeable cartridges. Each cartridge has multiple nozzles, and printing fluid extraction parameters can be made separately controllable for each nozzle.

A fluid ejector for ejecting discrete volumes of ejectant includes a body with opposing first and second surfaces. One or more nozzles are defined as conduits extending through the body between the surfaces to connect first and second orifices at the first and second surfaces respectively. The fluid ejector further includes a gas supply means having a gas outlet and an ejectant supply means. The ejectant supply means supplies the ejectant to the nozzles at a pressure above ambient via their supply orifices. The supply orifice is defined in a conduit's side or is the second orifice. Relative movement of the gas supply means and body exposes first orifices to the gas outlet allowing the gas supply means to supply gas at a pressure above ambient, wherein a pressure difference thereby created between the first and second orifices causes ejection of the ejectant from the nozzles through the second orifices.

A fluid ejector for ejecting discrete volumes of ejectant includes a body with opposing first and second surfaces. One or more nozzles are defined as conduits extending through the body between the surfaces to connect first and second orifices at the first and second surfaces respectively. The fluid ejector further includes a gas supply means having a gas outlet and an ejectant supply means. The ejectant supply means supplies the ejectant to the nozzles at a pressure above ambient via their supply orifices. The supply orifice is defined in a conduit's side or is the second orifice. Relative movement of the gas supply means and body exposes first orifices to the gas outlet allowing the gas supply means to supply gas at a pressure above ambient, wherein a pressure difference thereby created between the first and second orifices causes ejection of the ejectant from the nozzles through the second orifices.

A printer is configured to provide a jet of extraction gas that extracts a printing fluid from a printing nozzle in the presence of an electrostatic field that accelerates the extracted printing fluid toward a printing substrate. The printer is also configured to selectively turn the electrostatic field and the jet of extraction gas off and on to enable printing in an aerosol mode, an e-assisted aerosol mode, or an e-jet mode. The jet of gas can be provided by a second nozzle concentric with the printing nozzle. A third nozzle can discharge a focusing gas around the aerosol.

A liquid consumption device includes a cartridge, a tank and a consumption portion. The cartridge includes a first storage chamber. The tank includes a second storage chamber and a semipermeable membrane. The semipermeable membrane covers the communication port. The semipermeable membrane is configured to block a liquid. The semipermeable membrane is positioned above a level of the liquid stored in the first storage chamber in a state where the level of the liquid stored in the first storage chamber becomes equal to the level of the liquid stored in the second storage chamber because of a flow of the liquid from the first storage chamber to the second storage chamber due to water head difference as a result of the connection of the cartridge to the tank. The first storage chamber of the cartridge to connected to the tank stores therein a maximum amount of liquid.