<scp>3D</scp> Printing Process and Local Preheating Technique Study Using a Laser‐Based Method

ABSTRACT This study addresses the challenge of enhancing inter‐filament bonding in Fused Filament Fabrication (FFF) 3D printing, where conventional methods often result in suboptimal mechanical strength or structural distortions. A novel local preheating technique was introduced using a laser‐based approach to precisely control the temperature of previously deposited filaments. An experimental setup integrating a 3D printer with a 30 W diode laser and an optical system was developed to evaluate key parameters, including laser power, PLA color effects on laser absorptivity, and the relationship between preheating temperature and bonding strength. Results demonstrate that preheating to 180°C increases mechanical bonding strength by up to 35% without distortion, highlighting the technique's potential to improve FFF part quality.