Alchement - Color Change by Temp Series, 3D Filament, 1.75mm, 1kg (PLA - Grey to White) Color change series change colors depending on the temperature of the filament The filament change color at approximately 31C (88F). Above 31C, the filaments will turn into a different color. The easiest way to visualize this change is to simply blow a hair dryer on the filament. Weight: 1 kg (2.2lbs) / Roundness: 1.75mm (+/- 0.03mm)