What is "filament moisture absorption," and why is it important?

Filament moisture absorption refers to the ability of 3D printing filament to take in moisture from the surrounding environment. This phenomenon is particularly significant for filaments such as PLA, ABS, and nylon, which can hygroscopically absorb water vapor in the air. When filament absorbs moisture, it can lead to various issues during the printing process, including poor layer adhesion, inconsistent extrusion, and surface defects on the printed object.

High moisture content can cause the filament to bubble or pop when heated, which can result in weak spots and compromised mechanical properties in the final print. This makes controlling the moisture levels highly critical for achieving optimal print quality and strength. Ensuring that the filament is stored properly, usually in a dry environment or sealed bags with desiccants, is essential for maintaining its performance. Overall, moisture absorption is a key factor that can dramatically influence the outcome of 3D printed parts, making this understanding vital for anyone involved in Fused Deposition Modeling.