Steppers off during G4

[aceranic]

Hi, when my filament is being changed I have G4 P4000 whilwle waiting for MMU to move.
I have noticed that there is an issue with layer heigth which I found out it has changed due to filament change sequence force on gantry as XZ motors are off during this pause.
How to keep XZ under power during the G4?

[jay_s_uk]

@aceranic can you post your full config and firmware version?

[aceranic]

@jay_s_uk Running 3.5.3

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.3.10 on Mon Dec 06 2021 21:58:20 GMT+0100 (Central European Standard Time)

; General preferences
M575 P1 S1 B57600 ; enable support for PanelDue
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"TazmanSW" ; set printer name
M669 K2 X1:0:1 Y0:1:0 Z1:0:-1 ; select CoreXZ mode

; Network
M552 S0 ; enable network
M586 P0 S1 ; enable HTTP
M587 P192.128.68.68 ; connect to access point "Network-ssid-123" using WPA2-PSK authentication at specified IP address
M552 S1 ; enable networking as a client
M586 P1 S0 ; enable FTP
M586 P2 S0 ; enable Telnet

; Drives
M569 P0 S0 ; physical drive 0 goes forwards
M569 P1 S0 ; physical drive 1 goes forwards
M569 P2 S0 ; physical drive 2 goes forwards
M569 P3 S1 ; physical drive 3 goes backwards Extruder
M584 X0 Y2 Z1 E3 ; set drive mapping
;M350 X16 I0 ; configure microstepping without interpolation
M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z80.00 E562.00 ; set steps per mm
M566 X850.00 Y850.00 Z850.00 E240.00 ; set maximum instantaneous speed changes (mm/min)
M203 X30000.00 Y30000.00 Z30000.00 E10000.00 ; set maximum speeds (mm/min)
M201 X3000.00 Y3000.00 Z2000.00 E3500.00 ; set accelerations (mm/s^2)
M906 X1600 Y1600 Z1200 E1200 I0 ; set motor currents (mA) and motor idle factor in per cent
M84 S2 ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z-1 S1 ; set axis minima
M208 X372 Y400 Z315 S0 ; set axis maxima

; Endstops
M574 X1 S1 P"!xstop" ; configure switch-type (e.g. microswitch) endstop for low end on X via pin !xstop
M574 Y1 S1 P"!ystop" ; configure switch-type (e.g. microswitch) endstop for low end on Y via pin !ystop
;M574 Z1 S1 P"!zstop" ; configure switch-type (e.g. microswitch) endstop for low end on Z via pin !zstop
M574 Z1 S2 ; configure Z-probe endstop for low end on Z

; Z-Probe
M950 S0 C"exp.heater3" ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H10 F1200:420 T6000 ; set Z probe type to bltouch and the dive height + speeds
;G31 P25 X-30 Y-15 Z2.90 ; set Z probe trigger value, offset and trigger height
M557 X50:370 Y50:380 S50 ; define mesh grid
M280 P0 S160 I1 ; Probe reset

; 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 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 100C
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 s ensor 1
M307 H1 B0 S0.75 ; disable bang-bang mode for heater and set PWM limit
M143 H1 S280 ; set temperature limit for heater 1 to 250C

; Fans
M950 F0 C"fan0" Q255 ; 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" Q150 ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T55 ; set fan 1 value. Thermostatic control is turned on

; Tools for MMU
M563 P0 D0 H1 F0 S"Mosquito" ; 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
M563 P1 D0 H1 F0 ; define tool 1
G10 P1 R0 S0 ; set initial tool 1 active and standby temperatures to 0C
M563 P2 D0 H1 F0 ; define tool 2
G10 P2 R0 S0 ; set initial tool 2 active and standby temperatures to 0C
M563 P3 D0 H1 F0 ; define tool 0
G10 P3 R0 S0 ; set initial tool 3 active and standby temperatures to 0C

; Custom settings
;M572 D0 S0.3
M564 H0 ; allow movement of axes that have not been homed
M302 P1 ; allow cold extrusion
M950 P1 C"exp.heater4" ; allocate GPIO port1 to heater4 on expansion connector, 500Hz

;M955 P0 C"spi.cs4+spi.cs3" ; all wires connected to temp DB connector, no temperature daughterboard
M593 P"zvdd" F56 ; use ZVD input shaping to cancel ringing at 40.5Hz

;M98 P"load_variables.g" ; runs the macro in the file load_variables.g

M501 ; load config-override.g

[aceranic]

@aceranic is it M84 S2 causing this?

[jay_s_uk]

@aceranic said in Steppers off during G4:

M906 X1600 Y1600 Z1200 E1200 I0 ; set motor currents (mA) and motor idle factor in per cent
M84 S2 ; Set idle timeout

this is your problem

Set I in M906 to 30 and M84 S to 30 too.
At the moment your steppers will unhome after 2 seconds

[aceranic]

@jay_s_uk thanks a lot

M906 X1600 Y1600 Z1200 E1200 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout