A fluid ejection device comprising: a substrate comprising a first nozzle array and a second nozzle array, the first nozzle array and the second nozzle array each comprising a plurality of nozzles, the first and second nozzle arrays being arranged along a first direction (x), the first nozzle array being arranged spaced apart in a second direction (y) from the second nozzle array; a first fluid delivery pathway (122, 128) being in fluid communication with the first nozzle array; and a second fluid delivery pathway (132, 138) being in fluid communication with the second nozzle array, nozzles of the first nozzle array having a first opening area and being arranged along the first nozzle array at a pitch P, and nozzles of the second nozzle array have a second opening area, the second opening area being less than the first opening area, wherein at least one nozzle of the second array is arranged offset in the first direction (x) from at least one nozzle of the first array by a distance which is less than pitch P; characterized by the first nozzle array including a plurality of nozzles arranged in a first nozzle group at the pitch P and in a second nozzle group at the pitch P, the first group being spaced apart from the second group in the second direction (y); and the second nozzle array including a plurality of nozzles arranged in a first nozzle group at the pitch P and a second nozzle group at the pitch P, the first group being spaced apart form the second group in the second direction (y), wherein the nozzles of the first nozzle group and the second nozzle group of the second nozzle array are offset by a distance of P/4 in the first direction (x) when compared respectively to the first nozzle group and the second nozzle group of the first nozzle array.. a substrate comprising a first nozzle array and a second nozzle array, the first nozzle array and the second nozzle array each comprising a plurality of nozzles, the first and second nozzle arrays being arranged along a first direction (x), the first nozzle array being arranged spaced apart in a second direction (y) from the second nozzle array; a first fluid delivery pathway (122, 128) being in fluid communication with the first nozzle array; and a second fluid delivery pathway (132, 138) being in fluid communication with the second nozzle array, nozzles of the first nozzle array having a first opening area and being arranged along the first nozzle array at a pitch P, and nozzles of the second nozzle array have a second opening area, the second opening area being less than the first opening area, wherein at least one nozzle of the second array is arranged offset in the first direction (x) from at least one nozzle of the first array by a distance which is less than pitch P; characterized by the first nozzle array including a plurality of nozzles arranged in a first nozzle group at the pitch P and in a second nozzle group at the pitch P, the first group being spaced apart from the second group in the second direction (y); and the second nozzle array including a plurality of nozzles arranged in a first nozzle group at the pitch P and a second nozzle group at the pitch P, the first group being spaced apart form the second group in the second direction (y), wherein the nozzles of the first nozzle group and the second nozzle group of the second nozzle array are offset by a distance of P/4 in the first direction (x) when compared respectively to the first nozzle group and the second nozzle group of the first nozzle array..