A method of manufacturing a heat exchanger includes providing a first plurality of micro-tubes, wherein each micro-tube has a first side and a second side extending along a first axis, and providing a first plurality of fins, wherein each fin having a first base having a first face and a second face disposed opposite the first face. The method further includes disposing the first side of each micro-tube of the first plurality of micro-tubes on the first face of the first base of the first plurality of fins and joining an entire length of the first side of each micro-tube of the first plurality of micro-tubes to the first face of the first base of the first plurality of fins to define a first heat exchanger layer.