mk8 extruder steps per mm

İ have bought a mk8 extruder from china how can i setup mk8 steps per mm settings from marlin 1.1.8

You can change the steps/mm setting using the M92 code
eg.
M92 E102 ;set extruder0 steps to 102
M500 ;store new setting in eeprom,if enabled

old post but helpful...
So, I must set the extruder higher because the most important thing is the pressure that you apply, and off course that depend on the density of the material...
I did some nice printing with 2x the value.

You can calibrate as well, just extruder like 50 mm and measure it.
I have calibrate as fine as i could do.
The best way is to calibrate and extruder 2x (tow times) the "normal" value.
We are injecting a hot material so, if you inject very hard it gets more compressed and more strong...