Ender 3 Dual Z Axis Kit

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

FAQ
Q: How to use it in Ender 3 Max?
– Get the CR10 Kit
– Print PSU relocation bracket (e.g. https://www.thingiverse.com/thing:4601467)
– Use the wire that came with the cr10 kit. The 4 pin male goes to the main board where the original z stepper wire hooks up. Just scrape off the hot glue and pull it off.

Packaging List:
Dual Z Axis Upgrade Kit for Ender 3 Series x 1