An additively manufactured heat transfer device (10,100, 200, 312), comprising: an enclosure portion or housing (12, 110, 210, 318) including outer walls (18, 108, 208, 324) including a first conductive wall and a second conductive wall, the outer walls containing a first inner channel (14, 128, 228, 334) configured to direct flow of a coolant fluid and a second inner channel (16, 130, 230) configured to direct a flow of a coolant fluid, a first fluid intake port (32, 136, 234, 321) connected to the first inner channel, the first fluid intake port configured to direct flow of a coolant fluid through an outer wall (20A, 124, 224, 324) of the outer walls of the enclosure portion into the first inner channel, and a second fluid intake port (36, 134, 236) connected to the second inner channel, the second fluid intake port configured to direct flow of a coolant fluid through an outer wall (20A, 124, 224, 324) of the outer walls of the enclosure portion into the second inner channel, a first fluid outtake port (34, 138, 238, 323) connected to the first inner channel, the first fluid outtake port configured to direct flow of a coolant fluid through an outer wall (20B, 126, 218, 324) of the outer walls of the enclosure portion out of the first inner channel, a second fluid outtake port (38, 140, 240) connected to the second inner channel, the second fluid outtake port configured to direct flow of a coolant fluid through an outer wall (20B, 126, 218, 324) 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 (40, 132, 232, 338), 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 (12, 110, 210, 318) including outer walls (18, 108, 208, 324) including a first conductive wall and a second conductive wall, the outer walls containing a first inner channel (14, 128, 228, 334) configured to direct flow of a coolant fluid and a second inner channel (16, 130, 230) configured to direct a flow of a coolant fluid, a first fluid intake port (32, 136, 234, 321) connected to the first inner channel, the first fluid intake port configured to direct flow of a coolant fluid through an outer wall (20A, 124, 224, 324) of the outer walls of the enclosure portion into the first inner channel, and a second fluid intake port (36, 134, 236) connected to the second inner channel, the second fluid intake port configured to direct flow of a coolant fluid through an outer wall (20A, 124, 224, 324) of the outer walls of the enclosure portion into the second inner channel, a first fluid outtake port (34, 138, 238, 323) connected to the first inner channel, the first fluid outtake port configured to direct flow of a coolant fluid through an outer wall (20B, 126, 218, 324) of the outer walls of the enclosure portion out of the first inner channel, a second fluid outtake port (38, 140, 240) connected to the second inner channel, the second fluid outtake port configured to direct flow of a coolant fluid through an outer wall (20B, 126, 218, 324) 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 (40, 132, 232, 338), 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.