How does print temperature influence adhesion in FDM?

The influence of print temperature on adhesion in Fused Deposition Modelling (FDM) is significant, primarily because the temperature at which the filament is extruded directly affects its flow properties and the bonding process between layers. When the print temperature is properly set, it enhances the flow of the molten filament, allowing it to spread and fuse well with the previous layer. This improved bonding is critical for creating strong inter-layer adhesion, which directly impacts the overall strength and durability of the printed object.

At optimum temperatures, the material flows smoothly, is more pliable, and can better interlace with the previously extruded plastic, leading to a cohesive structure. This interaction is not only vital for the immediate layer being printed but also affects how subsequent layers adhere to it, ensuring that the prints maintain structural integrity and can withstand external forces.

In contrast, when temperatures are too low, the filament may not melt sufficiently, resulting in poor flow and inadequate layer bonding, which compromises adhesion. Meanwhile, excessively high temperatures can lead to other issues, such as overheating, which might degrade the material properties or cause unwanted deformation.

Thus, understanding the optimal print temperature is crucial for effective adhesion and successful FDM printing.