Abstract: An apparatus is to selectively purge a desired fluid-jet printhead of a number of fluid-jet printheads of a page-wide array fluid-jet device. The apparatus includes a purging insert movably locatable within a fluid channel of the page-wide array fluid-jet device. The fluid channel is to supply fluid to the fluid-jet printheads during normal operation of the page-wide array fluid-jet device. The apparatus includes a movement mechanism operatively coupled to the purging insert to move the purging insert within the fluid channel incident to the desired fluid-jet printhead. The apparatus includes a pressurizing mechanism fluidically coupled to the purging insert to pressurize fluid. The purging insert is to deliver the fluid as pressurized by the pressurizing mechanism to the desired fluid-jet printhead to purge the desired fluid-jet printhead.

Abstract: An ink supply system including a reservoir and a foam regulator. The reservoir is configured to hold a volume of ink and configured to be in fluid communication with a fluid ejection structure. The foam regulator is operable in a first state in which the foam regulator permits application of negative pressure through the foam regulator to apply negative pressure to the fluid ejection structure and to the reservoir, and a second state in which the foam regulator blocks passage of ink foam through the foam regulator.

Abstract: A method for white ink delivery includes circulating white ink through a white ink delivery system between successive print jobs; and in response to a time interval between two of the successive print jobs being greater than a threshold time interval, draining the white ink from the white ink delivery system.

Abstract: An ink supply system including a reservoir and a foam regulator. The reservoir is configured to hold a volume of ink and configured to be in fluid communication with a fluid ejection structure. The foam regulator is operable in a first state in which the foam regulator permits application of negative pressure through the foam regulator to apply negative pressure to the fluid ejection structure and to the reservoir, and a second state in which the foam regulator blocks passage of ink foam through the foam regulator.

Abstract: An apparatus is to selectively purge a desired fluid-jet printhead of a number of fluid-jet printheads of a page-wide array fluid-jet device. The apparatus includes a purging insert movably locatable within a fluid channel of the page-wide array fluid-jet device. The fluid channel is to supply fluid to the fluid-jet printheads during normal operation of the page-wide array fluid-jet device. The apparatus includes a movement mechanism operatively coupled to the purging insert to move the purging insert within the fluid channel incident to the desired fluid-jet printhead. The apparatus includes a pressurizing mechanism fluidically coupled to the purging insert to pressurize fluid. The purging insert is to deliver the fluid as pressurized by the pressurizing mechanism to the desired fluid-jet printhead to purge the desired fluid-jet printhead.