One of the main challenges in the additive manufacturing of optics is to produce surfaces smooth enough for optical applications. This study investigates the impact of using a vat with an optical diffuser layer on the surface quality of Digital Light Processing (DLP) printed samples, assessing their suitability for optical applications. The root mean square (RMS) roughness of surfaces printed with standard vats, so called UltraGLOSS vats, and dip-coated samples are compared. Results indicate that while the use of a diffuser layer in the vat enhances surface quality and achieves a glossy finish, the staircase effect inherent to layer-based printing remains significant. However, UltraGLOSS vats also show promise with improved roughness values compared to standard vats.