A fluidic ejection device, comprising: a fluidic ejection die embedded in a moldable material, the fluidic ejection die comprising: an array of nozzles disposed on a front surface of the fluidic ejection die, each nozzle comprising: an ejection chamber; an opening; and a fluid actuator disposed within the ejection chamber; a substrate having an array of passages formed therein, to deliver fluid to and from the ejection chamber from a backside of the fluidic ejection die; and an array of enclosed cross-channels, formed on a back surface of the substrate, each enclosed cross-channel of the array being fluidly connected to a respective plurality of passages of the array of passages, the array of enclosed cross-channels having an inlet port and an outlet port on the back of the fluidic ejection die, wherein each enclosed cross-channel is configured to force fluid flow therethrough between the inlet port and outlet port and close to the fluid ejection die, wherein fluid flow through the enclosed cross-channels is perpendicular to fluid flow in the passages; the moldable material in which the fluidic ejection die is disposed, wherein the moldable material comprises supply slots to deliver fluid to and from the fluidic ejection die; and a carrier substrate to support the fluidic ejection die and moldable material. a fluidic ejection die embedded in a moldable material, the fluidic ejection die comprising: an array of nozzles disposed on a front surface of the fluidic ejection die, each nozzle comprising: an ejection chamber; an opening; and a fluid actuator disposed within the ejection chamber; a substrate having an array of passages formed therein, to deliver fluid to and from the ejection chamber from a backside of the fluidic ejection die; and an array of enclosed cross-channels, formed on a back surface of the substrate, each enclosed cross-channel of the array being fluidly connected to a respective plurality of passages of the array of passages, the array of enclosed cross-channels having an inlet port and an outlet port on the back of the fluidic ejection die, wherein each enclosed cross-channel is configured to force fluid flow therethrough between the inlet port and outlet port and close to the fluid ejection die, wherein fluid flow through the enclosed cross-channels is perpendicular to fluid flow in the passages; an array of nozzles disposed on a front surface of the fluidic ejection die, each nozzle comprising: an ejection chamber; an opening; and a fluid actuator disposed within the ejection chamber; an ejection chamber; an opening; and a fluid actuator disposed within the ejection chamber; a substrate having an array of passages formed therein, to deliver fluid to and from the ejection chamber from a backside of the fluidic ejection die; and an array of enclosed cross-channels, formed on a back surface of the substrate, each enclosed cross-channel of the array being fluidly connected to a respective plurality of passages of the array of passages, the array of enclosed cross-channels having an inlet port and an outlet port on the back of the fluidic ejection die, wherein each enclosed cross-channel is configured to force fluid flow therethrough between the inlet port and outlet port and close to the fluid ejection die, wherein fluid flow through the enclosed cross-channels is perpendicular to fluid flow in the passages; the moldable material in which the fluidic ejection die is disposed, wherein the moldable material comprises supply slots to deliver fluid to and from the fluidic ejection die; and a carrier substrate to support the fluidic ejection die and moldable material.