A fluid ejector (100; 400; 500) for ejecting discrete volumes of ejectant, the fluid ejector comprising: a rigid body (110; 410, 510) having opposing first and second surfaces and at least one nozzle (114, 115, 116; 414, 415, 416; 514, 515, 516) defined between the first and second surfaces, each of the at least one nozzle defined by a conduit extending through the body to connect a first orifice defined at the first surface (111; 411; 511) of the body and a second orifice defined at the second surface (112; 412; 512) of the body; an ejectant supply means (130; 430; 530) for supplying ejectant (133; 433; 533) to each of one or more of the at least one nozzle through a supply orifice of the nozzle, wherein the supply orifice is the second orifice or is defined in a side of the conduit defining the nozzle; and a gas supply means (150; 450; 550) for supplying a gas to the one or more nozzles through the one or more first orifices, the gas supply means defining a gas outlet, the gas supply means and the body movable relative to each other, wherein, in use: the ejectant supply means supplies the ejectant to each of the one or more nozzles through the respective supply orifice at a pressure above ambient pressure, and relative movement of the gas supply means and the body exposes the one or more first orifices of the one or more nozzles to the gas outlet, enabling the gas supply means to supply gas to the one or more first orifices of the one or more nozzles at a pressure above ambient pressure, wherein for each of the one or more nozzles a pressure difference created thereby between the first orifice and the second orifice of the nozzle causes ejection of the ejectant from the nozzle through the second orifice. a rigid body (110; 410, 510) having opposing first and second surfaces and at least one nozzle (114, 115, 116; 414, 415, 416; 514, 515, 516) defined between the first and second surfaces, each of the at least one nozzle defined by a conduit extending through the body to connect a first orifice defined at the first surface (111; 411; 511) of the body and a second orifice defined at the second surface (112; 412; 512) of the body; an ejectant supply means (130; 430; 530) for supplying ejectant (133; 433; 533) to each of one or more of the at least one nozzle through a supply orifice of the nozzle, wherein the supply orifice is the second orifice or is defined in a side of the conduit defining the nozzle; and a gas supply means (150; 450; 550) for supplying a gas to the one or more nozzles through the one or more first orifices, the gas supply means defining a gas outlet, the gas supply means and the body movable relative to each other, wherein, in use: the ejectant supply means supplies the ejectant to each of the one or more nozzles through the respective supply orifice at a pressure above ambient pressure, and relative movement of the gas supply means and the body exposes the one or more first orifices of the one or more nozzles to the gas outlet, enabling the gas supply means to supply gas to the one or more first orifices of the one or more nozzles at a pressure above ambient pressure, wherein for each of the one or more nozzles a pressure difference created thereby between the first orifice and the second orifice of the nozzle causes ejection of the ejectant from the nozzle through the second orifice. the ejectant supply means supplies the ejectant to each of the one or more nozzles through the respective supply orifice at a pressure above ambient pressure, and relative movement of the gas supply means and the body exposes the one or more first orifices of the one or more nozzles to the gas outlet, enabling the gas supply means to supply gas to the one or more first orifices of the one or more nozzles at a pressure above ambient pressure, wherein for each of the one or more nozzles a pressure difference created thereby between the first orifice and the second orifice of the nozzle causes ejection of the ejectant from the nozzle through the second orifice.