Does M574 S4 work ?

  • I have 3 Z axis steppers, CoreXY, I have stallguard working as an endstop - well I thought I did - on initialization to ensure steppers are in synch I drive the bed all the way to the bottom of the frame where each stepper has a hard stop and where the bed is mechanically as level as I can get it.

    The problem arises when I deliberately put the steppers out of synch - to tilt the bed basically.

    When I drive the steppers to the bottom all three motors stop on the first motor that contacts the hard stop - this is not the behaviour I require - I need the other two to keep going until they themselves stall.

    To this end I used M574 Z2 S4, Z2 because the stall is at the prints highest point (as in 330mm not 0), s4 is supposed to stall each motor individually.

    M574 docu states

    • New endstop type S4 means use motor stall detection (like S3) but if there are multiple motors, stop each one individually as it stalls.

    It does not do this - it stops all three motors when the first stalls.

    I read a section referred to that describes splitting up the Z steppers into single channels but that doc states that it does not apply to RRF3 in the introduction

    somebody care to verify the definition for this

    ; Configuration file for Duet 3 (firmware version 3)
    ; executed by the firmware on start-up
    ; generated by RepRapFirmware Configuration Tool v2.1.4 on Mon Dec 30 2019 11:11:59 GMT+0000 (Greenwich Mean Time)
    ; General preferences
    G90                                                   ; send absolute coordinates...
    M83                                                   ; ...but relative extruder moves
    M550 P"Duet 3"                                        ; set printer name
    M669 K1                                               ; select CoreXY mode
    ; Drives
    M569 P0.0 S0                                          ; physical drive 0.0 goes forwards X
    M569 P0.1 S0                                          ; physical drive 0.1 goes forwards Y
    M569 P0.2 S1                                          ; physical drive 0.2 goes forwards E
    M569 P0.3 S1                                          ; physical drive 0.3 goes Forwards Z1
    M569 P0.4 S1                                          ; physical drive 0.4 goes Forwards Z2
    M569 P0.5 S1                                          ; physical drive 0.5 goes Forwards Z3
    M584 X0 Y1 Z3:4:5 E2 P3				                  ; set drive mapping
    M350 X16 Y16 Z16 E16 I1                               ; configure microstepping with interpolation
    M92 X160.00 Y160.00 Z1600.00 E409.00    	; set steps per mm
    M566 X90.00 Y90.00 Z12.00 E120.00       	; set maximum instantaneous speed changes (mm/min)
    M203 X4800.00 Y4800.00 Z1480.00 E120.00 		; set maximum speeds (mm/min)
    M201 X100.00 Y100.00 Z20.00 E250.00       	; set accelerations (mm/s^2)
    M906 X1680 Y1680 Z1330 E1330 I30            ; set motor currents (mA) and motor idle factor in per cent
    M84 S30                                               ; Set idle timeout
    ; Axis Limits
    M208 X-157:162 Y-157:149 Z0:3330				; set axis Min / Max
    M671 X-188.7:10:199 Y-127:199:-127 S10		; Set Bed Pivot Locations
    ; Extruder /  Hot end
    M308 S0 P"spi.cs0" Y" rtd-max31865" A"Hot End" 		  ; configure sensor 0 as a PT100 on Port 1 of temperature daughter board
    M950 H0 C"out1" T0                                    ; create nozzle heater output on out2 and map it to sensor 1
    M143 H0 S320                                          ; set temperature limit for heater 1 to 320C
    M307 H0 B0 S1.00                                      ; disable bang-bang mode for the nozzle heater and set PWM limit
    M563 P0 S"Extruder" D0 H0 F1                          ; 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
    M950 F0 C"out7"	Q500 A"Part Cool"		      		  ; set part cooling fan output
    M106 P0 H-1                  			      		  ; Thermostatic control is turned off
    M950 F1 C"out8" Q500 A"Extruder" 		      		  ; set hot end cooling fan output
    M106 P1 H0 T45               			      		  ; Thermostatic control is turned on, enables at 45C
    ; Bed
    M308 S1 P"temp0" Y"thermistor" A"Bed" T100000 B4725 C7.06e-8 	; configure sensor 1 as thermistor on pin temp0
    M950 H1 C"out2" T1 Q10                                			; create bed heater output on out1 and map it to sensor 1
    M143 H1 S120                                          			; set temperature limit for heater 0 to 120C
    M307 H1 B0 S0.5                                      			; disable bang-bang mode for the bed heater and set PWM limit
    M140 H1                                               			; map heated bed to heater 0
    ; MCU
    M308 S2 Y"mcu-temp" A"CPU"
    M950 F2 C"!out4" A"MCU" Q25000 L.07  
    M106 P2 T40:44 H2      ; set Duet cooling fan	
    ; Pinda Probe
    M308 S3 P"temp1" Y"thermistor" T100000 A"Pinda" B4725 C7.06e-8 	; configure sensor as thermistor on pin temp1
    M558 P5 C"!" H2 A3 F120 T2000          ; set Z probe type to switch filtered
    G31 P1 X-39 Y-31.5 Z2.0 C0.2 S40 H2                      ; set Z probe trigger, offset, trigger height, temperature compensation
    ; Spare Sensor
    ; M308 S4 P"spi.cs1" Y" rtd-max31865" A"Spare" 				  	; configure sensor 4 as a PT100 on Port 2 of temperature daughter board
    ; Filament Detection
    M591 D0 P3 C"" S1 R70:130 L24.8 E3.0 				;Duet3D rotating magnet sensor for extruder drive 0 is connected to I/O 5 input,
    														; enabled, sensitivity 24.8mm.rev, 70% to 130% tolerance, 3mm detection length
    ; Endstops
    M574 X1 S1 P"!"                                   ; configure active-hi endstop for low end on X via pin
    M574 Y1 S1 P"!"                                   ; configure active-hi endstop for low end on Y via pin
    M574 Z2 S4                              ; configure stall current detect endstop for Z
    M915 P3:4:5 S3 F0 H400 R0
    ; M915 P3 S3 F0 H400 R0
    ; M915 P4 S3 F0 H400 R0
    ; M915 P5 S3 F0 H400 R0
    ; define mesh grid
    ; LED Enable Relay
    M950 F3 C"out9" A"Led Relay" 		      ; set its name
    ; PINDA - Z-Probe
    G31 X-20 Y0
    ; Miscellaneous
    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

  • Moderator

    Version of RRF3?

  • Current version is RC2

  • After trying numerous different ways to define my Z axis and in the absence of other input I can only conclude that the S4 when applied to a single axis with multiple motors doesn't work.

    Currently I have no choice but to manually drive the Z axis manually and disable stall detection on it.

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