Depends on your firmware
But in Marlin
enable
#define DISTINCT_E_FACTORS
change
#define DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 4000, 500 } // X, Y, Z, E0
to
#define DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 4000, 500, 498, 512 } // X, Y, Z, E0 , E1, E2
Substituting your required values ...
Edited 1 time(s). Last edit at 06/09/2019 07:57AM by Dust.