An additively manufactured heat transfer device , comprising: an enclosure portion or housing including outer walls including a first conductive wall and a second conductive wall , the outer walls containing a first inner channel configured to direct flow of a coolant fluid and a second inner channel configured to direct a flow of a coolant fluid, a first fluid intake port connected to the first inner channel, the first fluid intake port configured to direct flow of a coolant fluid through an outer wall of the outer walls of the enclosure portion into the first inner channel, and a second fluid intake port connected to the second inner channel, the second fluid intake port configured to direct flow of a coolant fluid through an outer wall of the outer walls of the enclosure portion into the second inner channel, a first fluid outtake port connected to the first inner channel, the first fluid outtake port configured to direct flow of a coolant fluid through an outer wall of the outer walls of the enclosure portion out of the first inner channel, a second fluid outtake port connected to the second inner channel, the second fluid outtake port configured to direct flow of a coolant fluid through an outer wall of the outer walls of the enclosure portion out of the second inner channel; wherein each of the first inner channel and the second inner channel is defined by internal walls , the enclosure portion and the internal walls forming a single additively manufactured unit; the first and second inner channels being isolated from each other; and wherein each of the first inner channel and the second inner channel contacts both the first conductive wall and the second conductive wall . an enclosure portion or housing including outer walls including a first conductive wall and a second conductive wall , the outer walls containing a first inner channel configured to direct flow of a coolant fluid and a second inner channel configured to direct a flow of a coolant fluid, a first fluid intake port connected to the first inner channel, the first fluid intake port configured to direct flow of a coolant fluid through an outer wall of the outer walls of the enclosure portion into the first inner channel, and a second fluid intake port connected to the second inner channel, the second fluid intake port configured to direct flow of a coolant fluid through an outer wall of the outer walls of the enclosure portion into the second inner channel, a first fluid outtake port connected to the first inner channel, the first fluid outtake port configured to direct flow of a coolant fluid through an outer wall of the outer walls of the enclosure portion out of the first inner channel, a second fluid outtake port connected to the second inner channel, the second fluid outtake port configured to direct flow of a coolant fluid through an outer wall of the outer walls of the enclosure portion out of the second inner channel; wherein each of the first inner channel and the second inner channel is defined by internal walls , the enclosure portion and the internal walls forming a single additively manufactured unit; the first and second inner channels being isolated from each other; and wherein each of the first inner channel and the second inner channel contacts both the first conductive wall and the second conductive wall . <EOS>