Which method can NOT improve the surface finish in FDM prints?

In Fused Deposition Modeling (FDM), achieving a smooth surface finish is often a combination of the printing parameters and the materials being used. Among the provided options, inconsistent print speed cannot improve the surface finish.

When print speed is inconsistent, it leads to variations in the extrusion of the filament and the deposition of layers, resulting in visible imperfections, such as ridges and uneven surfaces. Maintaining a consistent print speed is essential for uniform layer bonding and ensuring that the filament is laid down evenly. If the print speed fluctuates, it can adversely affect the quality of the final product instead of enhancing it.

In contrast, using finer layers can significantly improve surface finish, as thinner layers allow for more precise detailing and smoother contours. Post-processing with solvents can help dissolve the outer layer of the material, smoothing out surface irregularities. Higher print temperatures can also enhance layer adhesion and increase the fluidity of the filament, which contributes to a smoother finish by filling in small gaps and imperfections as the material is deposited.