Note: This is not the final upgrade, you still need to add a belt tension on the top of the both lead screws to to prevent both z out of sync when printing stopped.
Double Z structure runs smoothly
Low upgrade cost, Cost-effective(high cost performance), technical guidance, mature solution
Minimal cost upgrade and maximum optimization
Using the original T8 leads to 2MM screw
Use all-aluminum coupling and original 42 stepper motor, stable operation
Dual Z Axis Upgrade Kit for Ender 3 Series x 1