@dc42 @droftarts

Thanks so much for your replies!

I hadn’t grounded the extruder motor casing or hotends yet, seems I missed that detail when I first built the printer. Looking back, it totally makes sense to ground those parts . It does make me wonder what’s changed recently that’s now causing ESD issues, when everything was fine before.

For now, I’ve attached a grounding wire to one of the casing screws on the back of the extruder stepper motor. I haven’t had time yet to ground the hotend properly in a non-janky way, so I will do that later (or when the issue remains I guess)

I’ll be printing the same model a few more times, so I’ll see if grounding just the stepper resolves the issue and report back.

Thanks again for the help

@Phaedrux

I am running with version 3.4.5:
FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 3.4.5 ELECTRONICS: Duet WiFi 1.02 or later FIRMWARE_DATE: 2022-11-30 19:36:12

I tested with a different cable from another motor to see if it would trigger the same warning on the extruder motor. It did again today. Could be that both cables are bade I guess. So I'll make two new motor cables later today to see if that helps.

The printer is a coreXY Dbot adaption that looks a bit similar to yours. All motors are fixed to the frame and there shouldn't be to much movement on the cables.

Hi,

I am suddenly running into the issue described by the title. During a print (after an irregular amount of time) my extruder stepper will stop rotating. When pausing the print to manually extrude I get the warning:

• "Warning: Driver 4 warning: phase A may be disconnected, phase B may be disconnected" (also happens on Driver 3)

When I reboot the Duet 2 Wifi board that I am using, everything works fine again.

I have checked to following items to see if they cause the problem but they appear to be fine:

• Stepper motor (windings measure 2.2 ohms)
• Bad cable (no cable break, no bad crimps, and no bad, discolored of burnt connector, checked with different cable)
• Swichting TMC stepper driver (both driver 3 and 4 have this issue)

The printer has been working fine for a couple of years now. I have cooling fans for the extruder motor and Duet PCB.
I am printing at speed 45 mm/s, acceleration 1100 mm/s2, jerk 10 mm/s with a bowden setup with linear advance enabled.
Extruder motor is NEMA17 0.9 deg/step running at 900 mA with 16 microstep. (I will post full config in below)

What annoys me most is that resetting the whole board fixes it .
I found some other posts on this forum but that did not help me solve my problem unfortunately.

; Configuration file for Duet WiFi (firmware version 3.3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.3.15 on Sat Dec 17 2022 17:53:26 GMT+0100 (Central European Standard Time)

; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"Dbot" ; set printer name
M669 K1 ; select CoreXY mode

M80 C"pson" ; allocates the pin and sets the pin in the power on state.
M81

; Network
M552 S1 ; enable network
M586 P0 S1 ; enable HTTP
M586 P1 S0 ; disable FTP
M586 P2 S0 ; disable Telnet

; 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 P4 S0 ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E4 ; set drive mapping
M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X200.00 Y200.00 Z10666.67 E315.00 ; set steps per mm
M566 X9000.00 Y9000.00 Z60.00 E1700.00 ; set maximum instantaneous speed changes (mm/min)
M203 X12000.00 Y12000.00 Z180.00 E1200.00 ; set maximum speeds (mm/min)
M201 X3000.00 Y3000.00 Z20.00 E1000.00 ; set accelerations (mm/s^2)
M906 X1200 Y1200 Z1700 E900 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 X370 Y330 Z300 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

; Z-Probe
M950 S0 C"exp.heater3" ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe_in" H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X-30 Y2 Z1.83; set Z probe trigger value, offset and trigger height
M557 X30:330 Y30:300 S75 ; define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B3950 ; 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
M307 H0 R2.445 K2.543:0.000 D5.36 E1.35 S1.00 B0
M140 H0 ; map heated bed to heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120C
M308 S1 P"e0temp" Y"thermistor" T100000 B4275 C7.06e-8 ; 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
;M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
M307 H1 R1.895 K0.337:0.000 D5.08 E1.35 S1.00 B0 V11.8
M143 H1 S280 ; set temperature limit for heater 1 to 280C

; Fans
M950 F0 C"fan0" Q25000 ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H1 T45 ; set fan 0 value. Thermostatic control is turned on
M950 F1 C"fan1" Q500 ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H-1 ; set fan 1 value. Thermostatic control is turned off

; 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