Geeetech

Hi,The lead screw has a diameter of 8, and a lead of 8,
If your lead screw is bent, you can contact your sales to replace it.

I found this: Z-axis steps_per_mm = (motor_steps_per_rev * driver_microstep) / thread_pitch

Motor_steps_per_rev: Steps per step of the stepper motor (200 steps for a 1.8-degree motor)
Driver_microstep: drive circuit subdivision
Thread_pitch : screw thread pitch

You can calculate it and modify it

Hi Jhonmicky,

If you open your 'configuration.h' file in the marlin folder (Any text editor will do)
You will see where the axis steps per mm are set - about 1/3rd the way down the file.
If you had ordinary 8mm rod in your printer, you will see a line where the z axis has a value of 2560...
For your new 8mm thread rods, this will be changed to 400.

ie... would become... Hope this helps

Gerry