When compared to layer-by-layer melting, Selective Laser Melting (SLM) is the preferred method for creating complex and unique components using Additive Manufacturing (AM). Optimising the SLM method to create very dense AlSi10Mg alloy components is the focus of this research. Optical microscopy and scanning electron microscopy (SEM) were used to examine the AM produced specimens for macro and micro structural examination, respectively. Additionally, the effect of layer thickness was investigated on the mechanical characteristics of AlSi10Mg alloy components, including micro-hardness and ultimate tensile strength (UTS). Analysis of the microstructure revealed differences in the shape and behaviour of the microstructure at the melt pool border of the deposited layer and further into the layer. Tensile strength was shown to increase with decreasing layer thickness from 60 m to 30 m, most likely as a result of reduced porosity, enhanced surface morphology, and ultra-fine cellular dendritic microstructure. Samples tested in the horizontal direction with a layer thickness of 30 m showed a 24% increase in UTS compared to samples tested with a layer thickness of 60 m