1.75mm Glow PLA Filament Glow in Dark PLA Filament Contains phosphorescent materials that glow in the dark after absorbing light energy. The glowing effect will be stronger under Sun light or UV light source after 30 miniutes,Enjoy different printing fun with Yousu 3D Glow in Dark PLA filament. Important NoteThis Glow in dark pla will have different glow result with different light source,Bright light or ultraviolet light will make the PLA filament or the printed model has a more bright light; It is suitable for fast printing and printing large-sized models, printed products have flat and smooth surfaces.