Product Characters 1.IdeaFormer 3D Dual Drive BMG Bowden Extruder utilizes an internal gearing ratio of 3:1 together with precision, cnc-machined hardened steel drive gears to give you a compact powerhouse for all your applications. 2. Unique Dual-Drive technology delivers uninterrupted material flow without fear of grinding or slipping in even the most demanding conditions. 3. Adjustable Tension: The thumbscrew tensioner allows the user to fine-tune the pressure exerted by the drive gears onto the filament. 4. Quick-Release: To be able to do material changes in a snap, simply activate the quick-release lever to release the tension and pull the material to be changed out of the extruder,keep it activated and insert the new material. BMG is designed to suit most DIY 3D printers like ender 3 whether it’s proximal extrusion or distal extrusion. Good product for 3D printer upgrading The filament control gears are made of CNC which are perfectly matched to each other with little gap. It helps avoid filament slipping especially for soft filament like TPU. Adjusting the tensioner to find suitable tightness. You can use any FDM filament with it. The shell is made of high hardness ABS which is more durable. Compared to normal extruder(1 gear with 1 idler pulley), BMG double gears provide high precision controlling of filament extrusion to prevent extruder from step losing. With 3:1 deceleration torque, users can control the extruder with high precision. And it’s easier to adjust manually. How to test your 3D Printer whether fit the BGM Extruder or not? 1,Measure the distance between the motor axis of extruder and four sides 2,Generally, it is only necessary to measure the size of the main body to determine whether it can be installed or not 3,Also there must be no any other parts aceessories to effect BMG Extruder in the space , which the measure disdance must over 20mm of the BMG Extruder handle and the spring, otherwise it is not fit to install your 3D printer HOW to USE Step 1:Install the Gear on Stepper Motor The toothed end is close to the motor,the distance fron the motor is about 3.5mm. Step 2:Install BMG on the Stepper Motor 1.One end is close,and the anqle between them is 30 degrees. 2.The two gears are close and the other end is slowly pressed down. Step 3: Install Screws Please tighten the screw after installation. Step 4 :Install Hand Screw If you swiitch soild filament to soft filament , you also need to adjust the tightness here Last step and Stick in the PTFE tube is well installed.