Z height offset changing

Phaedrux

Can you post your config.g and homeall.g?

whosrdaddy

Disable mesh bed leveling and then home the printer.

Adamfilip

config.g

; Configuration file for Duet WiFi
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool on Sun Oct 23 2016 10:30:40 GMT-0400 (Eastern Standard Time)

; General preferences
M111 S0 ; Debugging off
G21 ; Work in millimetres
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
M555 P2 ; Set firmware compatibility to look like marlin
M557 X20:260 Y0:240 S14 ; define a grid covering the XY area indicated with the specified grid spacing
M376 H10 ; Taper grid after 10mm

M667 S1 ; Select CoreXY mode
M208 X0 Y0 Z0 S1 ; Set axis minima
M208 X280 Y250 Z300 S0 ; Set axis maxima

; Endstops
M574 X1 S1 ; Reverse X endstop
M574 Y2 S1 ; Y Max Stop
;M574 E0 S1 ; Endstop for Zprobe on E0
M558 P4 X0 Y0 Z1 H4 F120 T6000 I1 ; Set Z probe type to switch, the axes for which it is used and the probe + travel speeds
G31 P600 X0 Y0 Z-1.8 ; Set Z probe trigger value, offset and trigger height
M581 E1 T1 ; Set Filament Sentinel to trigger and Pause print, if filament runs out

; Drives
M569 P0 S0 ; Drive X goes backwards
M569 P1 S0 ; Drive Y goes backwards
M569 P2 S0 ; Drive Z goes forwards
M569 P3 S0 ; Drive E3D Titan goes backwards
M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
M92 X200 Y200 Z800 E418.5 ; Set steps per mm
M566 X800 Y800 Z20 E800 ; Set maximum instantaneous speed changes (mm/min)
M203 X12000 Y12000 Z1500 E1800 ; Set maximum speeds (mm/min)
M201 X2000 Y2000 Z250 E250 ; Set accelerations (mm/s^2)
M906 X1200 Y1200 Z1300 E900 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Heaters
M143 S280 ; Set maximum heater temperature to 280C
M301 H0 S1.00 P10 I0.1 D200 T0.4 W180 B30 ; Use PID on bed heater (may require further tuning)
M305 P0 T100000 B4138 C0 R4700 L0 H0 ; Set thermistor + ADC parameters for heater 0
M305 P1 X200

; Tools
M563 P0 D0 H1 ; Define tool 0
G10 P0 X0 Y0 ; Set tool 0 axis offsets
G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C

; Network
M550 PTitanXY ; Set machine name
M552 S1 ; Enable network and acquire dynamic address via DHCP

; 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

; Custom settings are not configured

Adamfilip

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool on Sun Oct 23 2016 10:30:40 GMT-0400 (Eastern Standard Time)

; Relative positioning
G91

; Lift Z
G1 Z5 F6000 S2
G90

; Move towards X and Y axis endstops (first pass)
G91
G1 X-385 F2600 S1
G1 Y385 F2600 S1
G90

; Go back a few mm
G91
G1 X5 F6000
G1 Y-5 F6000
G90

; Move slowly to axis endstops once more (second pass)
G91
G1 X-285 F360 S1
G1 Y285 F360 S1
G90

G91 ; relative mode
G1 Z4 F200 S2 ; raise head 4mm to ensure it is above the Z probe trigger height
G90 ; back to absolute mode
G1 X140 Y140 F2000 ; put head over the centre of the bed, or wherever you want to probe
G30 ; lower head, stop when probe triggered and set Z to trigger height

; Uncomment the following lines to lift Z after probing
G91
G1 Z20 F1000
G90

aidar

Hi. Your trigger height in G31 command is -1.8 . What kind of probe are you using? If its not piezo, then this should be positive value. And i belive -1.8 is too much even if it is piezo.

Adamfilip

my Z endstop is special. it uses the nozzle and move the entire gantry vertically until its triggered. trust me that number is correct

Adamfilip

maybe since its a negative value that is somehow causing the firmware to miscalculate something, since its not typical

whosrdaddy

@adamfilip, did you try out my comment?
I suppose this is the printer we are talking about?

Adamfilip

Yes a revised version of that printer. I will try adding a G29 S2 at my ending code, and see if that makes any difference

Adamfilip

on my first test, adding the G29 S2, seems to have worked