A print head unit comprises a print head for ejecting droplets of a marking material; an electronic print head controller; and a coupling assembly for mechanically coupling the print head and the print head controller; wherein the coupling assembly provides a first coupling state and a second coupling state, wherein in the first coupling state, the print head and the print head controller are fixed relative to each other; in the second coupling state, the print head and the print head controller are enabled to move relative to each other within a limited range.The print head unit can be easily handled in the first coupling state, while in the second coupling state the print head may be mounted in a moving carriage without the print head controller affecting the position and rotation of the print head.