What is the primary function of bed adhesion materials in FDM 3D printing?

The primary function of bed adhesion materials in FDM (Fused Deposition Modeling) 3D printing is to help parts stick to the build plate during printing. Ensuring that the printed material adheres properly to the build surface is crucial because insufficient adhesion can lead to warping, shifting, or detachment of the part while it is being printed. This is particularly important during the initial layers, where the foundation of the print is established.

By using bed adhesion materials, which can take the form of adhesive sprays, tape, or specially formulated print surfaces, users can create a better bond between the printed filament and the build plate. This helps maintain the correct position of the part throughout the print process, resulting in higher quality prints and reduced chances of failure. Therefore, the correct answer emphasizes the critical role these materials play in ensuring successful 3D printing operations.