Defects in additive manufacturing (AM) occur due to a combination of material properties, process parameters, and environmental conditions. These defects can arise from improper laser power, scanning speed, or layer thickness. Common types of defects include porosity, caused by trapped gas or lack of fusion (LOF); residual stresses, which develop due to rapid cooling and can cause warping or cracking; surface roughness, resulting from uneven powder distribution or inadequate layer bonding; and microstructural inhomogeneities, where variations in cooling rates lead to inconsistent mechanical properties. In our research we are particularly focusing on the influence of differenct post-processing techniques, including preloading and Hot Isostatic Pressing (HIP), to help mitigate these defects and improve the quality of AM parts.