GO-3D Mini Glow in The Dark Blue PLA Color Changing 3D Printing Filament 1.75mm 225g Recommended Extrusion Temperatures: 190C-220C Normal PLA printing setting The color change occurs immediately after shut off the lights Glow in the Dark in Blue For the best results, place the filament / printing object under sunlight / UV flashlight exposure and move it back in the dark area.