how to set new step/unit for ffcp

[vtec35]

hi from france, i have an ffcp

actually i print with simplify3d, with step multiplier 1.42 for extruder



but for the jog mode, that not work, if i ask 100mm, i push only 70mm

where writer the good step per unit in the firmware for ffcp?

[vtec35]

thanks for your help....