Handheld and/or mountable fluid-ejection device having tip-extension assembly and/or tubings

A tip-extension assembly for a handheld and/or mountable fluid-ejection device, comprising:

• a fitting receptive to placement of a removable tip thereon, the removable tip having a fluid-ejection mechanism and an electrical connector;
• an electrical connector disposed on the substrate and receptive to electrical coupling with the electrical connector of the removable tip;
• and,
• an electrical cable connecting the electrical connector of the tip-extension assembly to the fluid-ejection device so that ejection of fluid from the removable tip is controllable by the fluid-ejection device.

A method comprising:

• fluidically coupling one or more first tubings from a fitting of a handheld and/or mountable fluid-ejection device on which a removable tip has been placed, to a supply of fluid external to the fluid-ejection device and the removable tip;
• fluidically coupling a pump within the first tubings between the supply of fluid and the fitting of the fluid-ejection device;
• fluidically coupling one or more second tubings from a backpressure-regulating mechanism to the fitting of the fluid-ejection device;
• the pump providing the fluid from the supply to the removable tip via the fitting;
• the backpressure-regulating mechanism maintaining a substantially constant backpressure against the fluid within the removable tip;
• and,
• the fluid-ejection device causing the removable tip to eject the fluid.