Hot end fan switches off at the start of the print.

GrahamExp

@siam M107 or M170? I see M107 not M170

SIam

;LAYER:0
M107
G0 F1800 X129.314 Y111.721 Z0.3

Somewhere in your slicer will add this and this switch your fan off

M107: Fan Off

Deprecated in RepRapFirmware. Use M106 S0 instead.

Note that M107 will turn off the print cooling fan(s) associated with the current tool (see the F parameter in the M563 command).

GrahamExp

@siam I see it, so how do I stop this from happening?

GrahamExp

@grahamexp OK but that is the current tool fan and it set to be using tool 0 the hot end fan is set to be fan 1 so it should then not be affected, right?

SIam

@grahamexp mmmhh I understand this so that this is the hot end cooler

dc42

@grahamexp that looks better. Now please post your complete config.g file.

GrahamExp

@siam yes corect I want it always on .. or at least on as soon as it reached 45 deg. It should not be affected by the g code at all in preference. like on the older duet 2 board you had those always on fan pins.

GrahamExp

@grahamexp ; Configuration file for Duet 3 (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.2.2 on Mon Feb 01 2021 21:18:26 GMT+0200 (South Africa Standard Time)

; General preferences
G90 ; Send absolute coordinates
M83 ; Relative extruder moves
M550 P"Viking 300" ; Set printer name to Viking 300
M669 K1 ; Select CoreXY mode
G21 ; Set to milimeters
M111 S0 ; Debugging off

; Network
M552 P192.168.0.176 S1 ; enable network and acquire dynamic address via DHCP
M586 P0 S1 ; enable HTTP
M586 P1 S0 ; disable FTP
M586 P2 S0 ; disable Telnet

; Drives
M569 P0.0 S1 ; physical drive 0.0 goes forwards
M569 P0.1 S1 ; physical drive 0.1 goes forwards
M569 P0.2 S1 ; physical drive 0.2 goes backwards
M569 P0.3 S1 ; physical drive 0.3 goes forwards
M584 X0.1 Y0.0 Z0.2 E0.3 ; set drive mapping
M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z3204 E1004.00 ; set steps per mm
M566 X900.00 Y900.00 Z60.00 E500 ; set maximum instantaneous speed changes (mm/min)
M203 X18000.00 Y18000.00 Z360.00 E3000.00 ; set maximum speeds (mm/min)
M201 X3000.00 Y3000.00 Z360.00 E3000.00 ; set accelerations (mm/s^2)
M906 X800 Y800 Z1000 E1200 ; set motor currents (mA) and motor idle factor in per cent
;M84 S30 ; Set idle timeout

; Axis Limits
M208 X-5 Y0 Z0 S1 ; set axis minima
M208 X300 Y300 Z360 S0 ; set axis maxima

; Endstops
M574 X1 S3 ; configure sensorless endstop for high end on X
M574 Y2 S3 ; configure sensorless endstop for high end on Y
M574 Z1 S2 ; configure Z-probe endstop for low end on Z

;Stall Detection
M915 X Y S3 R0 ; Stall detection on the X and Y axis With sensitivity set by S and Action set by R ("Take3 No Action")

;Pressure/Linear Advance
;M572 D0 S0.75 ; Pressure/Linear advance enabled with D selecting tool and S selecting value.

; Z-Probe
M950 S0 C"io7.out" ; create servo pin 0 for BLTouch
M558 P9 C"^io7.in" H5 F360 T6000 A1 B0.2 ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X-71 Y-42 Z3.0632 ; set Z probe trigger value, offset and trigger height
M557 X15:215 Y15:195 S40 ; define mesh grid

; Heaters
M308 S0 P"temp0" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out0" T0 ; create bed heater output on out0 and map it to sensor 0
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
M143 H0 S120 ; set temperature limit for heater 0 to 120C
M308 S1 P"temp1" Y"thermistor" T100000 B4138 ; configure sensor 1 as thermistor on pin temp1
M950 H1 C"out1" T1 ; create nozzle heater output on out1 and map it to sensor 1
M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
M143 H1 S275 ; set temperature limit for heater 1 to 275C

; Fans
M950 F0 C"out8" Q0 ; create fan 0 on pin out8 and set its frequency - Part Cooling Fan
M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"out7" Q500 ; create fan 1 on pin out7 and set its frequency - Hotend Cooling Fan
M106 P1 S1 T45 H1 ; set fan 1 value. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 F0:1 ; 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

; Miscellaneous
M575 P1 S1 B57600 ; enable support for PanelDue - io_0
M501 ; load saved parameters from non-volatile memory
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss

Phaedrux

@grahamexp said in Hot end fan switches off at the start of the print.:

; Tools
M563 P0 D0 H1 F0:1 ; define tool 0

You've got both fan0 and fan1 assigned to tool0 as the part cooling fan.

Change F0:1 to be F0

GrahamExp

@phaedrux problem solved. thank you for your help