3D printing filament is the thermoplastic feedstock for fused deposition modeling 3D printers. There are many types of filament available with different properties.[1]
Filament comes in a range of diameters, most commonly 1.75 mm and 2.85 mm,[2] with the latter often being confused with the less common 3 mm. [3]
Filament consists of one continuous slender plastic thread spooled into a reel.[4]