Abstract: An inkjet printer cartridge refilling machine (1) is provided comprising first mounting means (18) on which an empty printer cartridge can be mounted, nozzle means (12) adapted to extend into the printer cartridge and deliver ink to the printer cartridge, a second mounting means (23) adapted to releasably mount a cassette (29) containing ink of the specific type and volume required to refill the empty printer cartridge, the arrangement being such that the cassette (29), when mounted on the machine (1), is connected to the nozzle means (12), the machine (1) being operative to deliver ink from the cassette (29) to the printer cartridge to refill the printer cartridge. A method of refilling an ink cartridge, and an ink cassette are also provided.