In FDM printing, what defect may arise if a print speed is too high?

When the print speed is set too high in Fused Deposition Modelling, it can lead to under-extrusion. This occurs because the extruder may not be able to supply filament at a sufficient rate to keep up with the speed of the print head. As a result, there is not enough material deposited to create solid layers, leading to gaps or weak areas in the print. Under-extrusion can manifest as thin lines, missing sections, or an overall lack of detail, which compromises the structural integrity and appearance of the printed object.

The other options relate to different aspects of FDM printing. High adhesion is typically not a direct result of print speed, but rather a characteristic of the materials and the print surface used. Surface smoothness can be influenced by a variety of factors including layer height, nozzle size, and material properties, not solely speed. The possibility of “no defects” is unrealistic at higher speeds, as operational challenges inherently arise, especially in a technology as intricate as FDM.