What characteristic improves the durability of FDM prints?

Good layer adhesion is crucial for enhancing the durability of Fused Deposition Modelling (FDM) prints. When layers bond effectively, they create a cohesive structure that resists delamination and other types of structural failure. Each layer of filament joins well with the layers above and below it, resulting in a solid part that can withstand physical stresses better than prints with poor adhesion. Strong layer adhesion means less chance of cracks forming between layers during use, thus improving the overall integrity and lifespan of the 3D printed object.

In contrast, poor layer adhesion can lead to weak points in the print where layers may separate easily under stress, effectively compromising the object's strength. High surface roughness can create aesthetic issues and may also negatively affect layer bonding, while frequent defects are indicative of various print problems that can also lead to a reduction in the overall durability of the print. Thus, good layer adhesion is a fundamental characteristic that significantly contributes to the longevity and performance of FDM printed parts.