FDM parts are not particularly known for their great surface finish. Large z-layer heights and curved geometry can result in highly visible steps on a printed part, but there are ways we can help smooth and improve the visual quality. This tutorial will cover the creation of a vapor smoothing station, a system in which the user can expose 3D printed parts to acetone or other solvents to melt the printed material, filling gaps between layer lines, and giving a smooth, shiny appearance to the part.