Features: For 3D Ender3/3S. Upgraded 3D printers dual z-axis to improve printer stability After the upgraded of dual Z-axis, the x-axis rises steadily and runs smoothly, which completely avoids the bottom consumables, reduces the lamination caused by z-axis vibration, and greatly reduces the leveling difficulty. Use original T8 precise screw rod, it runs smoothly. All aluminum coupling and original 42stepper motor are used, stable operation. No need to welding or replace the mother board, directly insert this one to two motor wire into the mother board. Compared with the upgraded double Z-kit sold on the market, this kit contains a power fixed modules, which no longer allows this power supply to be scattered freely to avoid electric shock and short circuit. Specifications: Material:Sheet Metal+Stainless Steel Color: Black for Ender 3/3S 3D Printer Package Includes: 1x42-34Stepper Motor 2x Z-Axis Lead Screw Brackets 2xPower Supply Holder 1xLead Screw Bearing Guide 1xZ-Motor Brackets with screws and t-nuts 1x Cable 1x Coupler 1x 365mm T8 Lead Screw 1Set Matching screws and tools note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.