What type of materials typically require filament drying?

Filament drying is particularly important for hygroscopic materials, which are substances that readily absorb moisture from the air. Common 3D printing filaments such as nylon and PLA (Polylactic Acid) fall into this category. When these materials absorb moisture, their printing properties can be significantly affected. For instance, moisture can lead to issues such as stringing, bubbling, and reduced mechanical strength in the printed objects.

Nylon, known for its strength and flexibility, is especially sensitive to moisture; if it absorbs water, it can result in poor layer adhesion and even degrade the quality of the final product. PLA, although not as hygroscopic as nylon, can also absorb moisture over time, which may make it less effective during the extrusion process, leading to inconsistent filament flow and surface finish issues.

While other materials like metals, ceramics, and wood-based filaments might have their own specific processing needs, they do not typically require the same level of consideration regarding moisture content as the hygroscopic materials do. Therefore, the correct focus on hygroscopic materials highlights the need for proper filament storage and drying practices to ensure optimal printing performance.