A droplet deposition apparatus comprising: an array of fluid chambers, each chamber being provided with a nozzle and at least one piezoelectric actuator element operable to cause the release, on demand, of a droplet of fluid from the chamber through the nozzle in an ejection direction, the array extending in an array direction, substantially perpendicular to said ejection direction; a common inlet manifold extending at least substantially the length of said array and being elongate in said array direction, for supplying fluid to said array of chambers; a common outlet manifold extending at least substantially the length of said array and being elongate in said array direction, for receiving fluid from said array of chambers; and a first flow restrictor passage (28, 32) connecting said array of chambers to one of said common inlet manifold and said common outlet manifold (18, 19), so as to enable, respectively: a flow of fluid during use of the apparatus along the length of said common inlet manifold, through said first flow restrictor passage, then through said array of fluid chambers, and then into and along the length of said common outlet manifold; or a flow of fluid during use of the apparatus along the length of said common inlet manifold, through said array of fluid chambers, then through said first flow restrictor passage, and then into and along the length of said common outlet manifold; wherein said first flow restrictor passage (28, 32) extends substantially the length of said array in said array direction; wherein said one of the common inlet manifold and the common outlet manifold, and said first flow restrictor passage (28, 32) are shaped such that, when a cross-section taken perpendicular to the array direction is viewed, said first flow restrictor passage (28, 32) appears as a narrow, elongate passage leading from or to respectively said one of the common inlet manifold and the common outlet manifold (18, 19); wherein when a cross-section taken perpendicular to the array direction is considered, the first flow restrictor passage (28, 32) is relatively narrow in comparison to the manifold chambers and has an elongate cross-sectional shape; wherein said first flow restrictor passage has a width of greater than 175 microns and less than 700 microns; and wherein said first flow restrictor passage (28, 32) presents sufficient impedance to fluid flow such that, in use, fluid within said first flow restrictor passage adjacent said array of chambers is directed generally perpendicular to said array direction for substantially all the chambers within the array. an array of fluid chambers, each chamber being provided with a nozzle and at least one piezoelectric actuator element operable to cause the release, on demand, of a droplet of fluid from the chamber through the nozzle in an ejection direction, the array extending in an array direction, substantially perpendicular to said ejection direction; a common inlet manifold extending at least substantially the length of said array and being elongate in said array direction, for supplying fluid to said array of chambers; a common outlet manifold extending at least substantially the length of said array and being elongate in said array direction, for receiving fluid from said array of chambers; and a first flow restrictor passage (28, 32) connecting said array of chambers to one of said common inlet manifold and said common outlet manifold (18, 19), so as to enable, respectively: a flow of fluid during use of the apparatus along the length of said common inlet manifold, through said first flow restrictor passage, then through said array of fluid chambers, and then into and along the length of said common outlet manifold; or a flow of fluid during use of the apparatus along the length of said common inlet manifold, through said array of fluid chambers, then through said first flow restrictor passage, and then into and along the length of said common outlet manifold; wherein said first flow restrictor passage (28, 32) extends substantially the length of said array in said array direction; wherein said one of the common inlet manifold and the common outlet manifold, and said first flow restrictor passage (28, 32) are shaped such that, when a cross-section taken perpendicular to the array direction is viewed, said first flow restrictor passage (28, 32) appears as a narrow, elongate passage leading from or to respectively said one of the common inlet manifold and the common outlet manifold (18, 19); wherein when a cross-section taken perpendicular to the array direction is considered, the first flow restrictor passage (28, 32) is relatively narrow in comparison to the manifold chambers and has an elongate cross-sectional shape; wherein said first flow restrictor passage has a width of greater than 175 microns and less than 700 microns; and wherein said first flow restrictor passage (28, 32) presents sufficient impedance to fluid flow such that, in use, fluid within said first flow restrictor passage adjacent said array of chambers is directed generally perpendicular to said array direction for substantially all the chambers within the array.