Disposable printheads use a printhead that is part of a replaceable ink cartridge. Ink cartridges have been the traditional method for delivering ink to the printhead. Every time a cartridge is exhausted, the entire cartridge and printhead are replaced. The printhead sprays the ink on a rotating, oil coated drum. To date, the most successful commercial application of microfluidics is the inkjet printhead. If the printhead cannot be removed, the printer itself would need to be replaced. It works by using a thermal printhead to apply heat to layers of powdered thermoplastic. The viscosity can be optimized at jet time by using an appropriate printhead temperature. This is not to be confused with a clogged printhead. When in graphic mode (as opposed to text mode), the printhead can generate graphic images. All tracks arranged by the Fall except "Printhead" (arranged by the Fall and Martin Bramah). "Printhead" even verifies this fact within its own lyrics.