1. 3D printer J head hot end is suitable for 1.75mm and 3.0mm filament Wade or Bowden extruder 2. Have better heat dissipation and stability 3. Lighter weight, reducing the length of the hot end, making the feeding tube deeper into the hot end 4. Simple and applicable, heating tube, thermistor and aluminum block contact more fully, so that the temperature control is more accurate 5. 1.75mm consumables are delivered with 2 x 4 tubes, 3mm consumables are delivered with 3 x 4 tubes
