Hot end and bed turning off while homing

Thalios

Hello guys, having a weird thing happening and I'm pretty sure it's my configuration that's making it do this but I want to be sure.

Railcore II 300ZL

When I start a print, the printer homes itself (code in slicer) then auto levels the bed.

Problem I have is that the hot end and the bed are turned off while this happens. If the bed happens to be far away before homing, it takes 1-2 minutes to get to the top which means the hot end gets down to like 120 degrees, which means that when it starts printing, it is not hot enough and the extruder skips (of course).

Start gcode:

G28 ;Home
G32 ; true bed level
G1 Z15.0 F6000 ;Move the platform down 15mm
G92 E0 ; Reset Extruder
G1 X0 Y10 F24000.0 ; Move to start position
G1 Z0.3 F600 ; Drop Z
G1 X0 Y200.0 Z0.3 F1500.0 E15 ; Draw the first line
G1 X0.3 Y200.0 Z0.3 F1500.0 ; Move to side a little
G1 X0.3 Y20 Z0.3 F1500.0 E30 ; Draw the second line
G92 E0 ; Reset Extruder
G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
G1 X7 Y20 Z0.1 F5000.0 ; Move over to prevent blob squish
G92 E0.0
M572 D0 S0.06

config.g

; Configuration file for Duet 3 (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.1.3 on Mon Jul 06 2020 18:01:42 GMT-0400 (EDT)

; General preferences
G90                                                ; send absolute coordinates...
M83                                                ; ...but relative extruder moves
M550 P"Railcore SCR"                               ; set printer name
M669 K1                                            ; select CoreXY mode
M918 P1 E4 F2000000                                ; configure direct-connect display

; Network
M552 P0.0.0.0 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 S0                                       ; physical drive 0.0 goes backwards
M569 P0.1 S1                                       ; physical drive 0.1 goes backwards
M569 P0.2 S1                                       ; physical drive 0.2 goes forwards
M569 P0.3 S1									   ; physical drive 0.3 goes forwards
M569 P0.4 S1									   ; physical drive 0.4 goes forwards
M569 P0.5 S1                                       ; physical drive 0.5 goes forwards
M584 X0.1 Y0.0 Z0.2:0.3:0.4 E0.5                   ; set drive mapping
M350 X16 Y16 Z16 E16 I1                            ; configure microstepping with interpolation
M92 X200.00 Y200.00 Z1600.00 E849                  ; set steps per mm
M566 X1000 Y1000 Z100 E1500                        ; set maximum instantaneous speed changes (mm/min)
M203 X24000.00 Y24000.00 Z900.00 E3600.00          ; set maximum speeds (mm/min)
M201 X3000.00 Y3000.00 Z100.00 E1500.00            ; set accelerations (mm/s^2)
M906 X1400 Y1400 Z1000 E800 I60                    ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                            ; Set idle timeout


;Leadscrew locations
M671 X-10:-10:333  Y22.5:277.5:150 S15  ;Front left, Rear Left, Right  S7.5 is the max correction - measure your own offsets, to the bolt for the yoke of each leadscrew

; Axis Limits
M208 X0 Y0 Z0 S1                                   ; set axis minima
M208 X300 Y290 Z300 S0                             ; set axis maxima

; Endstops
M574 X1 S1 P"io1.in"                               ; configure active-high endstop for low end on X via pin io1.in
M574 Y1 S1 P"io2.in"                               ; configure active-high endstop for low end on Y via pin io2.in

; Z-Probe
M558 P9 C"io7.in" H5 R1 F120 T6000 A5 S0.02 B1     ; set Z probe type to bltouch and the dive height + speeds
M950 S0 C"io7.out"                                 ; create servo pin 0 for BLTouch
G31 X2 Y42 Z1 P25 							   	   ; Probe position and offset

; Mesh Grid
M557 X5:270 Y5:295 S20                             ; define mesh grid

; Paneldue 5i config
M575 P1 B57600 S1 								   ; Set auxiliary serial port baud rate and require checksum (for PanelDue)

; Filament monitor
M591 D0 P5 C"io3.in" R3:400 E3.0 S1

; Heaters
M308 S0 P"temp1" Y"thermistor" T100000 B4092       ; configure sensor 0 as thermistor on pin temp1
M950 H0 C"out0" T0                                 ; create bed heater output on out0 and map it to sensor 0
M140 H0                                            ; map heated bed to heater 0
M143 H0 S120                                       ; set temperature limit for heater 0 to 120C
M308 S1 P"temp0" Y"thermistor" T100000 B4092       ; configure sensor 1 as thermistor on pin temp0
M950 H1 C"out1" T1                                 ; create nozzle heater output on out1 and map it to sensor 1

M307 H0 A310.4 C721.8 D7.9 V23.9 B0                ; Bed Heaters
M307 H1 A519.9 C172.7 D4.8 V23.9 B0	               ; Heater 1 model
M570 S360				                           ; Hot end may be a little slow to heat up so allow it 180 seconds
M143 S285

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

; Tools
M563 P0 D0 H1 F1                                   ; define tool 0
G10 P0 R0 S0                                       ; set initial tool 0 active and standby temperatures to 0C


; Miscellaneous
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
T0                                                 ; select first tool
M106 P1 S0										   ; Turn off parts fan on boot

engikeneer

@Thalios most likely its something in your homeall.g or bed.g files (the ones called by G28 and G32). Can you post these too?

droftarts

@Thalios said in Hot end and bed turning off while homing:

; Z-Probe
M558 P9 C"io7.in" H5 R1 F120 T6000 A5 S0.02 B1 ; set Z probe type to bltouch and the dive height + speeds

It's the B1 parameter in your M558 command; see https://duet3d.dozuki.com/Wiki/Gcode?revisionid=HEAD#Section_M581_Configure_external_trigger
It can be a good idea to turn off heaters when homing with a BLTouch, as they can generate a magnetic field when turned on, that can cause false readings.

Ian

Thalios

@droftarts What would be the best line to add to my start gcode to tell it to reheat to the slicer's defined heat and wait for temp reached then proceed?

Can I simply add:

M116 H0 S5

after the homing?

Thalios

@engikeneer Homeall.g, all homes and bed.g are all clean.

droftarts

@Thalios Probably the easiest thing to do is to do a fast z home without turning the heaters off, then a slow one, like @Phaedrux suggests here https://forum.duet3d.com/post/172277
So add this to your homez.g and/or homeall.g:

M558 A1 F400 B0			; Set single probing at faster feed rate
G30 				; Do a single probe to home our Z axis
M558 A5 F120 B1			; Set multi probing at slower feed rate
G30				; Probe again to get a more accurate position

(I assume your Z can move at Z400; you have max speed as 900 in M203, so could even be set faster.)

Ian

Thalios

@droftarts said in Hot end and bed turning off while homing:

M558 A1 F400 B0 ; Set single probing at faster feed rate G30 ; Do a single probe to home our Z axis M558 A5 F120 B1 ; Set multi probing at slower feed rate G30 ; Probe again to get a more accurate position

Thanks. I'll do that!

engikeneer

@Thalios yeah I was barking up the wrong tree there... glad you got it sorted.

I actually suffer from a very similar thing (I have a Piezo so like to probe at 130deg so I don't damage the bed). One thing you could try is if your slicer allows you to use built-in placeholders (not sure what the technical term for it is...) in the start Gcode. In IdeaMaker, I have to have:

M104 T0 S130 ; start heating the extruder to 130deg but don't wait
M190 S{temperature_heatbed} ; set heatbed temp and wait
G28 ; home all axes
M109 S{temperature_extruder1}; Set extruder temp and wait

I think some slicers put the heating commands in after the start code rather than before. I usually use PrusaSlicer which does this so don't have to worry about the heating issues. It confused me what I firsttried using IdeaMaker...

You could also set your tool to 'standby mode' and set the standy temperature, then revert back to active? I think that would wait til it hit temperature. Or do the M116 you suggested (if it still thinks it is meant to be set to the print temperature)