What surface feature is desirable on a successful FDM printed object?

A smooth surface is desirable on a successful FDM (Fused Deposition Modeling) printed object because it signifies a high-quality print. Smooth surfaces indicate that the printer has accurately deposited material and maintained a consistent layer height throughout the printing process. This results in a visually appealing finish and better overall aesthetics, which is particularly important for parts that are meant to be functional or displayed.

Additionally, a smooth surface reduces the amount of post-processing needed, such as sanding or polishing, which can be time-consuming. It also enhances the performance of the part in functional applications, where surface friction, fit, and appearance can be critical factors. In contrast, textural irregularities, visible layer lines, and bubble distortions are generally seen as defects that can negatively affect both the look and the performance of the printed object, making them undesirable outcomes in the FDM printing process.