Over the last decade, Additive Manufacturing (AM) has been a breakthrough in the production of small and elaborate gas turbine components. Thanks to AM printing, it is possible to design advanced cooling schemes for high-temperature components with complex geometries that wouldn't be feasible with traditional industrial processes, thus increasing gas turbine efficiency. However, the surface roughness resulting from AM production influences the conduits' thermal and hydraulic performances, in terms of friction factor and heat transfer coefficients. Therefore, the aim of this study is to investigate the interaction between surface roughness and cooling performances through experimental analysis of different geometries additive manufactured mini-channels.