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1. Each needle has a label that marks the diameter of it. To make it easier to clean up, you can use a small diameter needle first and then use a needle with the right diameter;2. Don't use the needle to clean until the nozzle is heated to above 200℃(392℉). You can twist the needle to make it easier to clean up;3. After replace the nozzle, you'd better recalibrate the distance between nozzle and plate to ensure the quality of print parts;4. Size: total length: 70mm/2.76in;Needle length: 40mm/1.57in;Handle length: 30mm/1.19in