In jewelry, 3D-printed metal jewelry has been popular, while other materials have not. Perhaps not afraid of the tiger, jewelry brand Eternha, founded in 2020, has been experimenting with making men's bracelets out of composite materials. They chose nylon and glass fiber composite material, an industrial material commonly used in automotive and aerospace fields, as well as a material commonly used in the field of 3D printing at present. It has good impact resistance and toughness, presents a deep luster after hand polishing, and is approved for skin contact. Instead of 3D-printing the entire string of bracelets, Eternha 3D-printed the beads of the bracelet and combined them with obsidian, 925 silver, and stainless steel beads to create a multi-material mix of bracelets. Eternha says they want to incorporate a variety of elements into their bracelets, with 3D-printed nylon glass fiber beads that can be designed in a variety of shapes (cylinders, hexahedrons, irregular shapes, etc.) and the ability to incorporate logos such as logos to create unusual fashion pieces. LFT-G PA6-NA-LGF LFT & LFRT, Long fiber reinforced thermoplastic engineering plastics, compared to conventional short fiber reinforced thermoplastics, typically have a fiber length of less than 1 to 2 mm in conventional short fiber reinforced thermoplastics, while the LFT process The thermoplastic engineering plastics produced have been able to maintain fiber lengths above 5 to 25 mm. The long fiber is impregnated with a special resin system to obtain a long strip which is sufficiently wetted by the resin, and then cut into a desired length as required. The most used matrix resin is PP, followed by PA6, PA66, PPA, PA12, MXD6, PBT, PET, TPU, PPS, LCP, PEEK and the like. Conventional fibers include glass fiber and carbon fiber. Special fibers include basalt fiber and quartz fiber. The LFT of the long fiber material can achieve better mechanical properties. According to the final different applications, the finished product can be used for injection molding, extrusion and molding, etc., directly used to replace steel and thermoset products.