Geeetech

Geeetech Aluminum Prusa I3 A Pro 3D printer. When I program the Z axis to raise 10mm on the control box, the Z axis raises about 64mm. 6.4 times greater than the 10 mm requested. The Zstep/mm is set at 2560 in the firmware. 2560 divided by 6.4 yields a Zstep/mm of 400. I either need corrected firmware and instruction on how to install it, or I need a replacement control box with Zstep/mm = 400 in the firmware. At 0.2 per click of the adjustment knob, it takes me almost 4 minutes of continuous rotation to adjust from 2560 down to 400. Maybe my math is wrong and the number is not 400, but 2560 is definitely not the correct Zstep/mm value for this printer.

400 is the right value,actually you can modify it in the firmware...
Remember to "Save memory" after you modify it on LCD panel.

Now that I've changed and saved the Zstep/mm from 2560 to 400, the motion distance is corrected. However the Z axis moves much slower when homing. What should the other Z axis settings be set at? Currently, Vz Jerk = +0.4, Vmax Z = 2, and Amax Z = 20.