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