Heat exchangers are often single parts that are designed to meet the requirements for heat transfer and ambient conditions. This gas cooler, designed by Modell- und Formenbau Blasius GERG GmbH, uses additive manufacturing options in combination with a planar design of triple periodic minimal structures (TPMS) to increase the efficiency. It is used in a wood-fired power plant to cool down the exhaust gases by exchanging heat with water and recovering and reusing the heat. The design combined with a high-performance material such as copper results in excellent performance. This part is made from pure copper using the TruPrint 5000 Green Edition. This is equipped with a green laser to machine this highly reflective material with the right tool. The material properties are the same as conventional pure copper ETP without the need for heat treatment (101% IACS electrical conductivity, 394 W/(m*K) thermal conductivity).