3D printing filament is the thermoplastic feedstock for fused deposition modeling 3D printers. There are many types of filament available with different properties, requiring different temperatures to print. Filament is commonly available in the two standard diameters of 1.75 mm and 2.85 mm. 2.85 mm filament is sometimes erronously referred to as "3 mm", but should not be confused with the less common filament size that actually measures 3 mm in diameter.Filament size should not be confused with the nozzle size, and several different combinations of nozzle and filament sizes may be used. One of the most common nozzle sizes is 0.4 mm, while examples of other common sizes includes 0.35 mm and 0.25 mm.Differentiated from powder and liquid resin for other 3D printing technology, the filament is produced into one continuous slender plastic thread in hundred meters long, which is usually spooled into a reel for purpose of storage and printer feeding.
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