Printing: PTFE head double-sided printing, can be used for fixing, anti-corrosion, and rust . Spare parts: you have any questions about the product, please uspromptly, and we will provide you with satisfactory service. Easy installation: and disassemble, tools required, the PTFE connector to the cloned . Bowden Connector PTFE Head Pneumatic Head for Cloned Drive Extruder Upgraded Bowden Extruder 1.75mm Explanation: Good , and easy to use. First, press in the metal body components, and then gently press in theblue cover. Suitable for BMGextruder