Recent studies show that within additive manufacturing processes, especially powder bed fusion of metals using a laser beam (PBF-LB/M), argon-helium mixtures, such as ADDvance® Laser 230, have advantages over argon or nitrogen. These incorporate a reduction in the number and temperature of process by-products. A reduction of both effects results in increased process stability and part quality. The positive influences of this mixture are demonstrated by printing a large and complex heat exchanger. The printed part, powder, and process quality are then compared to the process carried out under an argon atmosphere. In addition to improved part quality, a considerable reduction in filter cloggage and powder loss can be observed