The most common technologies in the 3D printing market are fused deposition technology (FDM), laser stereoprinting (SLA), digital illumination laser technology (DLP) and selective sintering technology (SLS). FDM is the most common technology on the market. PLA and ABS are the main materials used. The forming process of this technology is to heat consumables and melt them into liquid and extrude a piece of wire through a spinning nozzle.multiple filaments are arranged side by side to form a figure of a plane. The forming accuracy of this technology is limited by the size of nozzle diameter, which is about 0.1 mm. A kind of
Laser stereolithography (SLA), which is a commonly used technology in industrial printers, uses ultraviolet ray to irradiate photosensitive resin to make a series of chemical reactions on the surface layer, so that liquid photosensitive resin can be formed into solid state. Because the diameter of laser can be very small, this kind of forming precision is relatively high and the surface forming quality is relatively good, but this kind of machine is generally more expensive. The cheapest in China is over 2W, and the preservation of photosensitive resin materials is difficult. A kind of
Digital illumination laser technology (DLP) is similar to SLA in that DLP uses a projector-like illumination instead of a laser beam, which improves the forming speed a lot. Selective Sintering Technology (SLS), which utilizes metal or gypsum powders, combines powdered materials with each other to form complete solids in the irradiated area by laser irradiation. At present, this technology has few core technologies in China and the strength of the model can not meet the requirements of use. A kind of
The above four technologies are commonly used in domestic models at present. FDM is usually used for low accuracy, SLA is more expensive for higher accuracy.