The colour printing process has the print material 28 fed by pinch rollers through a number of cylinder print roller stages 1-1,1-2--- 1-n each of which handles a specific colour. Each printing stage has an associated switching mechanism 2.1--2-n each of which receives commands from a central controller 3. Each of the switching mechanisms operates to move the print roller against the material when a colour is needed and avoids contact when is not required. unused ink is evacuated.
