Selective laser sintering (SLS) printing is the core technology for 3D printing in various industries. However,the surface finish of SLS prints is often uneven and rough, making it difficult to satisfy the aesthetic qualityand functional requirements of a product. Improving surface roughness is essential for functional parts andindustries with strict appearance requirements. In this study, the surface roughness of the SLS output wasimproved using a bead blasting post-processing method capable of large-capacity post-processing regardless ofshape, and an experiment was conducted with blasting pressure and duration as the process variables. Surfaceroughness was measured, and the influence of the process variables was analyzed using analysis of varianceand an interaction plot. The results of the experiment confirmed that the surface roughness improvement ratewas up to 61% under 4 bar and 30 min post-treatment conditions.