A restrictor plate for an ink jet print head assembly 100, the restrictor plate comprising: a substantially flat body having one or more fluid flow passageways extending through the body, the one or more fluid flow passageways including opposite side walls (1106, 1108), and elongated between a fluid receiving volume end and an opposite fluid ejection volume end, the fluid receiving volume end configured to be fluidly coupled with a chamber holding a volume of ink in the ink jet print head assembly, the fluid ejection volume end configured to be fluidly coupled with an orifice of the ink jet print head assembly from which the fluid is ejected to print the fluid onto an object, wherein the fluid receiving volume end of the one or more fluid flow passageways is configured to receive the volume of ink from the chamber so that the ink flows through the one or more fluid flow passageways to the fluid ejection volume end of the one or more fluid flow passageways along a printing direction to be ejected from the orifice of the ink jet print head assembly and printed onto the object, the printing direction being the direction of flow of the ink within the one or more fluid flow passageways towards the orifice, wherein the body is shaped around the one or more fluid flow passageways to form one or more bottlenecks in the one or more fluid flow passageways that increase a fluid flow resistance of the fluid along a direction in the one or more fluid flow passageways that is opposite of the printing direction, and wherein the body includes a flow restriction protrusion extending into at least one of the one or more fluid flow passageways, the flow restriction protrusion also increasing the fluid flow resistance of the fluid along the direction that is the opposite of the printing direction; characterized in that the flow restriction protrusion includes a spinal segment elongated along the printing direction and plural arm segments separated from each other and extending away from the spinal segment into the fluid flow passageway. a substantially flat body having one or more fluid flow passageways extending through the body, the one or more fluid flow passageways including opposite side walls (1106, 1108), and elongated between a fluid receiving volume end and an opposite fluid ejection volume end, the fluid receiving volume end configured to be fluidly coupled with a chamber holding a volume of ink in the ink jet print head assembly, the fluid ejection volume end configured to be fluidly coupled with an orifice of the ink jet print head assembly from which the fluid is ejected to print the fluid onto an object, wherein the fluid receiving volume end of the one or more fluid flow passageways is configured to receive the volume of ink from the chamber so that the ink flows through the one or more fluid flow passageways to the fluid ejection volume end of the one or more fluid flow passageways along a printing direction to be ejected from the orifice of the ink jet print head assembly and printed onto the object, the printing direction being the direction of flow of the ink within the one or more fluid flow passageways towards the orifice, wherein the body is shaped around the one or more fluid flow passageways to form one or more bottlenecks in the one or more fluid flow passageways that increase a fluid flow resistance of the fluid along a direction in the one or more fluid flow passageways that is opposite of the printing direction, and wherein the body includes a flow restriction protrusion extending into at least one of the one or more fluid flow passageways, the flow restriction protrusion also increasing the fluid flow resistance of the fluid along the direction that is the opposite of the printing direction; characterized in that the flow restriction protrusion includes a spinal segment elongated along the printing direction and plural arm segments separated from each other and extending away from the spinal segment into the fluid flow passageway.