i think the problem was, that i had the printer right besight a window where a lot of light entered i moved the printer to a darker place and haddent had any further problems

@fcwilt thank for the respones, i actually do that in my homing file

@fcwilt G30 S-1 ?

okay i did that but my Z0 stays like in the picture after homing again

@juanito16k said in IR Sensor is not homing the Z-Axis correctly:

G31 P500 X0 Y-20 Z1.265

Hello,

i have trouble to home my Z-Axis. I calibrated my config according to the guide "Test and calibrate a Z probe" with the Paper-Method so i use G92 to have Z0 where the nozzle pins the Paper and then i probe the bad and get between 1.25 and 1.3 mm which i put in to my config. Wenn i move the bad then back to Z0 and i put a Paper between the Paper will pin again.

Wenn i then home the Z-Axis again for example after switching the power off shortly then the Z-Axis homes again to Z6,25 for example but when i move the bad to Z0 the Paper wont pin again actually there is a big gap between nozzel and bad.

in the first run befor homing again, for probing the bad, the prob goes really near the bad and trigger at 625 on the probe field in the web interface. But in the second homeing it just probe 100 and doesnt get anyway near as in the first probing?

Following i send my config and home, i hope someone can help me.

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.2.0 on Wed Jan 06 2021 00:32:39 GMT+0100 (Mitteleuropäische Normalzeit)

; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"BLVCube" ; set printer name
M669 K1 ; select CoreXY mode

; Network
M551 P"jaw89jaw89" ; set password
M552 S1 ; enable network
M586 P0 S1 ; enable HTTP
M586 P1 S0 ; disable FTP
M586 P2 S0 ; disable Telnet

; Drives
M569 P0 S1 ; physical drive 0 goes forwards
M569 P1 S1 ; physical drive 1 goes forwards
M569 P2 S1 ; physical drive 2 goes forwards
M569 P3 S1 ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E3 ; set drive mapping
M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X200.00 Y200.00 Z400.00 E420.00 ; set steps per mm
M566 X900.00 Y900.00 Z60.00 E120.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00 ; 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 X330 Y300 Z600 S0 ; set axis maxima

; Endstops
M574 X1 S1 P"xstop" ; configure active-high endstop for low end on X via pin xstop
M574 Y1 S1 P"ystop" ; configure active-high endstop for low end on Y via pin ystop
M574 Z1 S2 ; configure Z-probe endstop for low end on Z

; Z-Probe
M558 P1 X0 Y0 Z1 C"zprobe.in" H5 F120 T6000 ; set Z probe type to unmodulated and the dive height + speeds
G31 P500 X0 Y-20 Z1.265 ; set Z probe trigger value, offset and trigger height
M557 X50:330 Y50:300 S30 ; define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0
M307 H0 A74.3 C590.5 D=3.0 V24.2 B0 ; Set PID for heated bad
M140 H0 ; map heated bed to heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120C
M308 S1 P"e0temp" Y"thermistor" T100000 B4138 ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 A279.5 C105.0 D6.9 V23.7 ; disable bang-bang mode for heater and set PWM limit
M143 H1 S280 ; set temperature limit for heater 1 to 280C

; Fans
M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500 ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T45 ; set fan 1 value. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 F0 ; 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

; Custom settings are not defined

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v3.2.0 on Wed Jan 06 2021 00:32:39 GMT+0100 (Mitteleuropäische Normalzeit)
G91 ; relative positioning
G1 H2 Z5 F6000 ; lift Z relative to current position
G1 H1 X-305 Y-285 F1800 ; move quickly to X or Y endstop and stop there (first pass)
G1 H1 X-305 ; home X axis
G1 H1 Y-285 ; home Y axis
G1 X5 Y5 F6000 ; go back a few mm
G1 H1 X-305 F360 ; move slowly to X axis endstop once more (second pass)
G1 H1 Y-285 ; then move slowly to Y axis endstop
G90 ; absolute positioning
G1 X200 Y160 F6000 ; go to first bed probe point and home Z
G30 ; home Z by probing the bed

; Uncomment the following lines to lift Z after probing
;G91 ; relative positioning
;G1 Z5 F100 ; lift Z relative to current position
;G90 ; absolute positioning