3D Printer Parts DIY Reprap Kossel Prusa Planet Reducer Motor Bowden Extruder This bowden extruder can use 1.75 mm and 3 mm filament ,just need to change the aotu joint couplers. Also,you can fix it on any place you want. Special design, easy to adjust the tension of springs and filament. Weight: 0.26kg Note:The default is 1.75mm