scratch last i changed the sensitivity to S2 and it worked but it also jogged the Y axis back slightly is this a belt tension issue? ps thanks for your help and the speedy responses

I changed the code to

M574 X1 S3                                     ; configure sensorless endstop for low end on X
M574 Y1 S1 P"ystop"                            ; configure active-high endstop for low end on Y via pin ystop
M915 X:Y S5 F1 R0							       ; sensorless homing parameters

it still runs into the x end and they pushes the y axis back

So i last used my printer with RR 1.2 just updated and renewed the config and everything works apart from the sensorless homing no matter what i set the motor current to or the sensitivity it just plants into the x home and makes loads of noise i have included my complete config and also the testing macro that i am using.

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2.1.8 on Wed Apr 22 2020 22:44:08 GMT+0100 (British Summer Time)

; General preferences
G90                                            ; send absolute coordinates...
M83                                            ; ...but relative extruder moves
M550 P"HEVO"                                   ; set printer name

M669 K1                                        ; select CoreXY mode

; Network
M552 S1                                        ; enable network
M586 P0 S1                                     ; enable HTTP
M586 P1 S0                                     ; disable FTP
M586 P2 S0                                     ; disable Telnet
M552 P192.168.1.103							   ; set fixed IP

; 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 S0                                     ; physical drive 3 goes backwards
M584 X0 Y1 Z2 E3                               ; set drive mapping
M350 X16 Y16 Z16 E16 I1                        ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z4000.00 E420.00             ; set steps per mm
M566 X900.00 Y900.00 Z12.00 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 X300 Y00 Z200 S0                         ; set axis maxima

; Endstops
M574 X1 S3                                     ; configure sensorless endstop for low end on X
M574 Y1 S1 P"ystop"                            ; configure active-high endstop for low end on Y via pin ystop
M915 X S5 F1 R0							       ; sensorless homing parameters
 
; Z-Probe
M950 S0 C"exp.heater3"                         ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H5 F100 T2000            ; set Z probe type to bltouch and the dive height + speeds
G31 P25 X36 Y10 Z2.5                           ; set Z probe trigger value, offset and trigger height
M557 X15:215 Y15:195 S20                       ; 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
M143 H0 S120                                   ; set temperature limit for heater 0 to 120C
M307 H0 B1 S1.00                               ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0                                        ; map heated bed to heater 0
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
M143 H1 S280                                   ; set temperature limit for heater 1 to 280C
M307 H1 B0 S1.00                               ; disable bang-bang mode for heater  and set PWM limit

; 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 S"E3D V6" 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

M400                    ; make sure everything has stopped before we make changes
M574 X1 S3              ; set endstops to use motor stall
M913 X25        ; reduce motor current to 50% to prevent belts slipping
G91                     ; use relative positioning
G1 H1 X-300 F4000 ; move all carriages up 700mm, stopping at the endstops           
G90                     ; back to absolute positioning
M400                    ; make sure everything has stopped before we reset the motor currents
M913 X100 Y100 Z100     ; motor currents back to normal
G1 X0 Y0 F2000          ; centre the head and set a reasonable feed rate
M574 X2 Y2 Z2 S1        ; set endstops back to normal so that homedelta.g works

for some reason when i run the macro it moves the Y axis toward the back?

yes i know it makes more sense to use a physical endstop but it worked when i built the printer and havent easily left space to wire in the additional stop

@dc42 it’s not that, I have the sock and I’m not printing using a cooling fan

Bloody frustrating print starts and runs fine gets to second ish layer and faults

Error: Heating fault on heater 1, temperature excursion exceeded 15.0°C
Resume-after-power-fail state saved

then have to emergency stop the printer to get it to reset.

Watching the temps it prints at 225 then suddenly drops to 180 and fails. im thinking my cartridge thermistor is probably buggered?

running my meshlevel macro

G90 ; Absolute coordinates
M557 X0:240 Y0:220 S20 ; Bed probe from and to
M401 ; Lower BLTouch probe
G29 S2 ; Clears bed height map in RepRapFirmware
G29 ; Kicks off the Z probing across the height map
M402 ; Retract BLTouch probe

Returns this, and skips the first layer of probe points on the Y0

M98 P0:/macros/meshlevel.g
Warning: Skipping grid point (0.0, 0.0) because Z probe cannot reach it
Warning: Skipping grid point (20.0, 0.0) because Z probe cannot reach it
Warning: Skipping grid point (40.0, 0.0) because Z probe cannot reach it
Warning: Skipping grid point (60.0, 0.0) because Z probe cannot reach it
Warning: Skipping grid point (80.0, 0.0) because Z probe cannot reach it
Warning: Skipping grid point (100.0, 0.0) because Z probe cannot reach it
Warning: Skipping grid point (120.0, 0.0) because Z probe cannot reach it
Warning: Skipping grid point (140.0, 0.0) because Z probe cannot reach it
Warning: Skipping grid point (160.0, 0.0) because Z probe cannot reach it
Warning: Skipping grid point (180.0, 0.0) because Z probe cannot reach it
Warning: Skipping grid point (200.0, 0.0) because Z probe cannot reach it
Warning: Skipping grid point (220.0, 0.0) because Z probe cannot reach it
Warning: Skipping grid point (240.0, 0.0) because Z probe cannot reach it

@dc42 said in BLTouch was working and now isn't.:

M307 H3 A-1 C-1 D-1

so i changed it to M307 H3 A-1 C-1 D-1 and it seems to work, cant remember why i would have it set differently?

I use Chrome and mine defaults to http://192.168.0.39/

M307 is there however i had it configured to this

M307 H3 A465.7, C176.6, D3.2 S1 ;
M558 P5 X0 Y0 Z1 H5 F120 T2000
G31 X32 Y10 Z2.9 P25

So i had a month or so not using my printer, went back on today and tried to reset the bltouch pin using a macro.

M280 P3 S160 I1

it returns;
M98 P0:/macros/Reset BLtouch
Error: Invalid servo index 3 in M280 command

Nothing has changed in my config so i have no idea what has gone wrong.

M307 H3

returns

M307 H3
Heater 3 model: gain 340.0, time constant 140.0, dead time 5.5, max PWM 1.00, calibration voltage 0.0, mode PID, inverted no, frequency default
Computed PID parameters for setpoint change: P13.4, I0.482, D51.4
Computed PID parameters for load change: P13.

It's a pain as i am keen to get printing again.