Features: Upgrade 3D printers such as for Ender3/3S to dual z-axis to improve printer stability. After the upgrade of dual Z axis, the x-axis rises steadily and runs smoothly, which completely avoids the bottom consumables stacking pressure, reduces the lamination caused by z-axis vibration, and greatly reduces the leveling difficulty and leveling times. Use T8 precision screw rod, it runs smoothly. All aluminum coupling and 42 stepper motor are used, stable operation. No need to weld or replace the motherboard, directly insert to two motor wire into the motherboard. Compared with the upgraded double Z kit sold on the market, this kit contains a power fixed module, which no longer allows the power supply to be scattered freely to avoid electric shock and short circuit. Specifications: Fits for: Compatible with for 3/3S 3D Printer Due to different batches, the appearance, color and printed words of the product , which will not affect the use. Material: Metal colour: Black Package Contents: 1 x 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.