... interlock device, smooth surface, no bumps, independent R&D, folded no break, high hardness, high strength, lots alternative colors.Production ... , fully automated, orderly winding, outstanding surface gloss. Established in 2002, Esun have a first-grade PLA/ABS production facility ... bubble,high tenacity and stable melting point,which is popular in the 3D printer like RepRap, Makerbot, Mendel, Huxley UP ...