Simple : No welding, No modification, No need other tools, Easy to install.High Quality: with All-aluminum coupling and original 42-34 , Double Z structure runs smoothly.Mature Solution: The dual z axis upgrade kit is compatible with 3/ 3 Pro/ 3 V2/ 3D printer. 3D printers with low cost efficiency to Dual Z axis mode.The dual Z-axis upgrade kit is an system that can you with a perfect solution to prevent the X rack from shaking. The kit contains the original 42 , which can stable operation and movement, which greatly improves the accuracy of the 3D printer.Due to the dual Z-axis update, the X-axis rises steadily and runs smoothly, which completely avoids the stacking of the underlying consumables, reduces the layer pattern caused by the Z-axis 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 and tighten the screws. Use hexagon socket screws and Z AxisMotor bracket to fix the motor on the aluminum .3) Remove all the screws of the sheet metal pulley on the right side of the X axis.4) Fix the Z-axis sheet metal with long screws, and then install it on the X-axis 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 guide on the left and right sides of the X-axis aluminum , and raise the Z-axis to the highest position. If one side is not level, turn the corresponding coupler clockwise.8) Install the lead screw guide and tighten the screws, paying attention to the alignment position of the mounting base.Color: as shown: metal + plasticPackage Contents: 1 x For 3 Dual Z Axis Upgrade KitOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.