Nozzle too low, hits bed
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At the moment I only have an endstop on the Z axis and I can get it to home and stop about .4mm above the bed when the endstop is triggered. However, when it goes to print the head drops further down so the head actually has to move to the 2mm mark before the endstop is no longer recognized as triggered.
This is on a Prusa I3 clone (which I need to get running well enough to print parts for different printer), I am running firmware 1.21 and here is the config.g file:
; General preferences
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves; Network
; Drives
M569 P0 S0 ; Drive 0 goes forwards
M569 P1 S0 ; Drive 1 goes forwards
M569 P2 S1 ; Drive 2 goes forwards
M569 P3 S1 ; Drive 3 goes forwards
M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
M92 X80 Y80 Z2561 E97.28 ; Set steps per mm
M566 X900 Y900 Z12 E120 ; Set maximum instantaneous speed changes (mm/min)
M203 X6000 Y6000 Z180 E1200 ; Set maximum speeds (mm/min)
M201 X500 Y20 Z250 E250 ; Set accelerations (mm/s^2)
M906 X800 Y800 Z800 E800 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout; Axis Limits
M208 X0 Y0 Z0 S1 ; Set axis minima
M208 X200 Y190 Z200 S0 ; Set axis maxima; Endstops
M574 X1 Y2 Z1 S1 ; Set active low endstops; Z-Probe
M558 P0 H5 F120 T6000 ; Set Z probe type to switch and the dive height + speeds
G31 P0 X0 Y0 Z0.4 ; Set Z probe trigger value, offset and trigger height
M557 X15:185 Y15:175 S20 ; Define mesh grid; Heaters
M305 P0 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S120 ; Set temperature limit for heater 0 to 120C
M305 P1 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C; Fans
M106 P0 S0.3 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H1 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P2 S1 I0 F500 H1 T45 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on; Tools
M563 P0 D0 H1 ; Define tool 0
G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C; Automatic saving after power loss is not enabled
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See https://duet3d.dozuki.com/Wiki/ConfiguringRepRapFirmwareCartesianPrinter#Section_Homing_Z for how to set the Z=0 point. If you require further help, please post your homez.g and homeall.g files.
