Temperature color change: Under 31ºC it looks Purple and above that it starts change to red. Feed smoothly and constantly without clogging the nozzle or extruder, perfectly compatible with most of the FDM 3D Printer Recommended Extrusion (205~210℃); Recommended print speed(Below 30mm/s); No heating bed requirement in summer, it is best to warm up the hot bed to about 60 °C in wintering Filament 1 KG (approximately 2.20 lbs) Spool,1.75mm Filament Diameter (Dimensional Accuracy +/- 0.03mm) Industrial & Scientific Additive Manufacturing Products 3D Printing Supplies 3D Printing Filament