Simple Assemble: No welding, No modification, No need other tools, Easy to install. High Quality: with All-aluminum coupling and original 42-34 stepper motor, Double Z structure runs smoothly. Solution: The dual z upgrade kit is compatible with 3/ 3 Pro/ 3 V2/ 3D printer.Easily improve 3D printers with low cost efficiency to Dual Z mode. The dual Z- upgrade kit is an excellent system that can provide you with a perfect solution to prevent the X rack from shaking. The kit contains the original 42 stepper motor, which can stable operation and smooth movement, which greatly improves the accuracy of the 3D printer. Due to the dual Z- update, the X- rises steadily and runs smoothly, which completely avoids the stacking of the underlying consumables, reduces the layer pattern caused by the Z- vibration, and greatly reduces the difficulty and frequency of leveling. Installation Notes: 1) Turn off the printer, unplug the power cord, and then use a hex wrench to remove the two screws that fix the power supply to remove the power supply. 2) Install the coupler on the stepper motor and tighten the screws. Use hexagon socket screws and Z AxisMotor bracket to fix the motor on the aluminum profile. 3) Remove all the screws of the sheet metal pulley on the right side of the X . 4) Fix the Z- sheet metal with long screws, and then install it on the X- right sheet metal. Screw the T8 screw into the nut of the coupler, and then tighten the screw of the coupler. 5) Install the Dual-Z stepper cable to the main board and connect two Z motors. 6) Install the screw and fixing nut on the power supply bracket, and then continue to install the power supply. 7) Place the lead screw bearing guide on the left and right sides of the X- aluminum profile, and raise the Z- to the highest position. If one side is not level, turn the corresponding coupler clockwise. 8) Install the lead screw bearing guide and