Olearn All Metal Reprap 42 Stepper Motor Bowden Extruder
1. Special design, easy to adjust the tension of springs and filament.
You can fix it on any place you want.
2. This bowden extruder can use 1.75 mm and 3 mm filament, just need to change the joint couplers.
3. Extrusion Wheel Bore Size: 5mm, Or 8mm（default is 5mm）
4. it is used with 42 Stepper Motors