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Heat exchangers

Heat exchangers for all sorts of applications, including rocket engines, can be made by machining grooves into a base metal, filling the grooves with wax, electroforming copper or nickel over the wax, bonding it to the base metal, then removing the wax leaving intricate channels throughout the structure.  This makes a heat exchanger of any size or shape with complex cooling channels all of a single piece of metal with no braze or weld joints.