[4mm lead screw against the original one]

lol.  Well a quick hack is to scale up your models in 2X in the Z direction only (cura can do this if you unlock the axis) and then set flow to 50%.

What kind of printer do you have?  

If it's a Ultimaker original these are both fantastic:

http://marlinbuilder.robotfuzz.com/

or

https://bultimaker.bulles.eu/

Basically you need to change steps/mm and double that value.  If you have UM2 you can get tinkermarlin and adjust it right from the front panel.

First tell me your printer (it's okay if it's a prusa) and then I can tell you more details of how to build Mariln.

It's Ultimaker 2+

[4mm lead screw against the original one]

Hi,

I've just replaced my Z axis lead screw with a new 4mm pitch one, now I'm trying to print but my print table travel has the half stroke ! I know I should reconfigure the "configuration.h" file but HOW !??