Hello, I have been fighting this problem for 2 days and i can´t solve it. I can home my 3 axis on my prusa i3, and the extruder works fine using manual controls ( it can extrude and reverse) but once I click on priting, it homes the axis and then the extruder motor starts to vivrate loudly in place.
I don´t understand. In my Marlin Firmware i got
// default settings
#define DEFAULT_AXIS_STEPS_PER_UNIT {80, 80, 4000,600} // default steps per unit for Ultimaker
#define DEFAULT_MAX_FEEDRATE {250, 250, 3.3, 25} // (mm/sec)
#define DEFAULT_MAX_ACCELERATION {3000,3000,100,10000} //
