What is the standard filament diameter typically used in FDM 3D printers?

The standard filament diameter typically used in Fused Deposition Modeling (FDM) 3D printers is indeed 1.75 mm or 2.85 mm. These two diameters are the most common in the industry, with 1.75 mm being widely favored for a variety of printing applications due to its versatility and compatibility with most consumer-grade FDM printers.

The 2.85 mm filament is often used as a standard by some brands and professional-grade printers but has become less common in recent years as the 1.75 mm filament has gained popularity. Both filament sizes are designed to work seamlessly with the majority of FDM printers, providing sufficient material flow and reliability for various projects.

Using the correct filament diameter is vital for optimal print quality, as the printer's extrusion system is engineered to accommodate these specific sizes. Thus, selecting 1.75 mm or 2.85 mm reflects an understanding of the standards in the FDM 3D printing landscape.