Topcool Electronic Tech. is located in DongGguan City, GuanDong Province. We have 8 years plastic extrusion experience and set up a new export branch in year 2013, which focused on 3D printing filaments and rainbow loom kits. All these items are new and hot sell around the world. There are 3 production lines for 3D filaments, including ABS, PLA, Nylon and other high quality 3D printing consumable material. Each have 1.75mm and 3.0mm.type, tolerance of filament roundness is +/- 0.05mm. ...