The most popular type of 3D printing is called fused deposit modeling, which uses filament on a spool to create 3D objects. This is the most common  style of 3D printer for hobbyists and most small businesses, because FDM printers are easy to buy, and the filament material is cheap and plentiful. There are, however, different types of filament, each one good for certain projects and terrible for others.
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