Sunlu PLA+ Silk Filament (Rainbow) 06Sunlu PLA+ Silk Filament (Rainbow) 06 Sunlu's rainbow colored filament is an excellent choice for those who want to give their 3D prints a unique, glossy finish. The material provides a bright, shimmering surface, making the models look exceptionally attractive even without additional finishing. The gradual color change approximately every 8 meters gives each print a unique, rainbow like appearance that catches the eye and highlights the design