This repair kit is compatible with for 3, 3 Combo 3D printer. 5 pieces of silicone cover + 5 pieces of 0.4 mm brass nozzle + 1 set of heating device kit (heating case box, thermal resistance, heat block, throat, nozzle) + 1 inner hexagon wrench. The thermal printed head is compatible with for 2 series. It can use 1.75 mm PLA/ABS/PETG/TPU/.Using all-metal throat and special nozzle design to heat the print head evenly. The inside of the nozzle is smooth and without burrs, which not only reduces air resistance, suppresses filaments, and is smooth and smooth, supports high -speed printing up to 250 mm/s. Before use, check whether the heating pipe and thermal resistance have been tightened, and the nozzle is fixed to avoid printing problems. Colour:As Shown Material:Metal Package Contents: 1set * for 2 max Assembled Printing Hot End Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.