Posts made by Tarasque_1024

Fixed by changing the bed settings to:
; Bed
M305 P0 T100000 B4185 R2200 ; Set thermistor + ADC parameters for heater 0

; Heaters
M307 H0 B0 S1.00 ; Disable bang-bang mode for the bed heater and
M307 H0 A153.5 C555 D0.3 B0 ; Heatbed
M307 H1 A278.6 C158.2 D3.8 S1.00 V24.2 B0

; set PWM limit
; Bed
M305 P0 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S80 ; Set temperature limit for heater 0 to 80C
; Hotend
M305 P1 T100000 B4725 C7.060000e-8 ; Set thermistor + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C

---

The config was used previously with a Duet Wifi - bed temp reading was accurate with it.

Is there any configuration needed around the bed temperature sensor to get it accurate? I've just wired up a Maestro and it's reporting the bed to be around 10C when the ambient temperature is 25C. I'll need to check hotter temps, but it was around 62C when set to 50C (if I remember correctly).

@3ddevil I have no idea about rework (or lack there of). The pin and solder are all crumbly - it took minimal pressure (with fingers) to convert into dust. I don't recall anything odd looking with the board when installing, although that was in January (so I might have forgotten). I'm sure I would have noticed if it looked like it did in the pics above - that doesn't look healthy at all.

@EasyTarget Thanks for the annoted pic. Will help with troubleshooting (should I have any issues in future)

@dc42
I've taken the board out and turned it over to find this:

It looks the the Bed - pin of the screw terminal has failed. The 'corroded' pin popped off with a light touch and the terminal itself doesn't feel secure (flexes easily). There is a slight bubble there - likely due to heat from the short.

Looks like the screw terminal will need to be replaced, but the mosfet is likely to be ok?

@EasyTarget said in Duet 2 Wifi - Bed no longer heating:

There are other things that could be tested, in particular the gate and source voltages of the mosfet to verify that it is receiving the gate signal, and that it's source is properly grounded.

How do I check that?

I don't think it's a wiring issue - it's been functioning fine for several months before failing. The wiring wasn't changed in that time. I've connected the bed to a different board and it works (using the same wiring and powersupply)

@EasyTarget Thank you for your help!

As I got the board in January, I suspect it's likely out of warranty. The external mosfet is likely going to be the easiest (and fastest) route for me.

Wonder if Duet offer a repair service...

@whosrdaddy Thanks!

@EasyTarget
Looks like the mosfet has failed then. 24V on both terminals when bed is off, and 24V on both when bed is on.

I have a multimeter - would this be in AC or DC (voltage) mode?

@EasyTarget
How would I check this with a multimeter? I've very little knowledge on using one - used Youtube to work out how to check the resistance and voltage.

When checking the voltage on the pins of the screw terminal, where do I need to put the second probe so it can measure?

@3ddevil
The bed has been working fine for the last 8-9 months. So unlikely to be wiring.

The VIN readout (via the web interface) is 24.2V - I had it heating the extruder during that time and it didn't budge. I also had the bed 'on' but it wasn't changing in temperature.

@droftarts

I didn't pull it, because it seems to be very securely inserted. It does however appear to be functional.

It looks normal

The bed does heat up when connected to a different board. I just checked now and it does have resistance. I've also run a continuity test on the bed at it seems fine. When driven by the Duet at set to a temperature, it's reading no voltage. With the original board it heats up and there is voltage as it heats up.

My bed has just stopped heating mid print. After cycling power, it still refuses to heat up. I've checked the fuse and it appears to be intact. The red LED lights up when the heater is 'active' and goes out when the heater is off. I connected the bed up to the previous board (upgraded to duet 10 months ago) and it does heat up - so unlikely to be an issue with the bed itself.

Any ideas on what the issue could be?

@dc42 said in Tool switching inconsistancy:

Are you sure that none of the movements you are seeing are in the GCode generated by your slicer?

I was until I just checked a the gcode file again. Looks like the slicer is still putting in the retraction and extrudes for the tool switch (even though I have the figures blanked out now - previously was using the slicer to handle the tool changes).

Looks like the double retract and tool change made it look like it wasn't doing the purge before the wipe and the slicer then extruding to cancel the retraction is what I was mistaking for the purge.

; Configuration file for Duet WiFi (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2 on Wed Jan 16 2019 20:01:12 GMT+0000 (Greenwich Mean Time)

; General preferences
M555 P2 ; Set output to look like Marlin
G21 ; Work in millimetres
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves

; Network
M550 P"EnderDuet" ; Set machine name
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet

; Drives
; X
M569 P0 S0 ; Drive 0 goes forwards
; Y
M569 P1 S0 ; Drive 1 goes forwards
; Z
M569 P2 S1 ; Drive 2 goes forwards
; E0
M569 P3 S1 ; Drive 3 goes forwards
; E1
M569 P4 S0 ; Drive 4 goes forwards
; E2
;M569 P5 S0 ; Drive 5 goes forwards

; DLV - 2019-01-22 14:20 - Map drives
; M584 X0 Y1 Z2 E3:4:5
M584 X0 Y1 Z2 E3:4

; Multi-extruder
M350 X16 Y16 Z16 E16:16 I1 ; Configure microstepping with interpolation
;M92 X80.00 Y80.00 Z400.00 E141.84:141.84 ; Set steps per mm
; DLV - 2019-04-06 17:35 - New E steps
M92 X80.00 Y80.00 Z400.00 E141.84:141.84 ; Set steps per mm
M566 X900.00 Y900.00 Z12.00 E120.00:120.00 ; Set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z300.00 E1200.00:1200.00 ; Set maximum speeds (mm/min)
M201 X1000.00 Y1000.00 Z150.00 E250.00:250.00 ; Set accelerations (mm/s^2)
M906 X600.00 Y600.00 Z600.00 E600.00:700.00 I30 ; Set motor currents (mA) and motor idle factor in per cent

; Single Extruder
;M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
;M92 X80.00 Y80.00 Z400.00 E141 ; Set steps per mm
;M566 X600.00 Y600.00 Z12.00 E120.00 ; Set maximum instantaneous speed changes (mm/min)
;M203 X9000.00 Y9000.00 Z1000.00 E1200.00 ; Set maximum speeds (mm/min)
;M201 X1000.00 Y1000.00 Z150.00 E250.00 ; Set accelerations (mm/s^2)
; DLV -2019-02-11 16:30 - Was 800mA, reduced to 700mA
;M906 X800.00 Y800.00 Z800.00 E800.00 I30 ; Set motor currents (mA) and motor idle factor in per cent
;M906 X700.00 Y700.00 Z700.00 E700.00 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
; DLV - 2019-0-413 16:40 - Increased X to 245 for PurgeBox
M208 X245 Y235 Z250 S0 ; Set axis maxima

; Endstops
;M574 Z1 S0 ; Set active low and disabled endstops
M574 Z1 X1 Y1 S1 ; Set active high endstops

; Z-Probe
M558 P0 H5 F120 T6000 ; Disable Z probe but set dive height, probe speed and travel speed
M557 X15:5 Y15:195 S20 ; Define mesh grid

; Heaters
M307 H0 B0 S1.00 ; Disable bang-bang mode for the bed heater and
; DLV - 2019-01-22 13:15 - Tuned Heater settings
M307 H0 A153.5 C555 D0.3 B0 ; Heatbed
M307 H1 A438.4 C150.3 D6.2 B0 ; Hotend

set PWM limit
; Bed
M305 P0 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S120 ; Set temperature limit for heater 0 to 120C
; Hotend
M305 P1 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C

; Fans
M106 P0 S0.3 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H1 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 ; Define tool 0
G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
G10 P0 R180 S180 ; Set initial tool 0 active and standby temperatures to 0C
M563 P1 D1 H1 ; Define tool 1
G10 P1 X0 Y0 Z0 ; Set tool 1 axis offsets
G10 P1 R180 S180 ; Set initial tool 1 active and standby temperatures to 0C
;M563 P2 D2 H1 ; Define tool 2
;G10 P2 X0 Y0 Z0 ; Set tool 2 axis offsets
;G10 P2 R180 S180 ; Set initial tool 2 active and standby temperatures to 0C

; Automatic power saving
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Set voltage thresholds and actions to run on power loss

; Custom settings are not configured

; Miscellaneous
M501 ; Load saved parameters from non-volatile memory

; Pressure Advance
;M572 D0:1:2 S0.1
M572 D0:1 S0.1

I'm getting some inconsistancies when switching tools - T1 seems to change the execution order of some of the GCODE instructions in the tpost1.g.

The tool changing process is as follows:

1 - Retract and Z hop
2 - Move across to purge bucket
3 - Retract for filament switch
4 - Reset E values
5 - Extrude new filament (reverse of 3)
6 - Purge filament
7 - Wait 1s for pressure to stabilise
8 - Reverse previous Z hop
9 - Wipe nozzle

Observed tool changing process:
Tool 0 always seems to work as expected. Tool 1 works perfectly on the first layer, but reverses the purge and wipes on subsequent layers (does the purge after the wipe). Tool 1 also seems to wait (longer than expected) between the preload of new filament and the purge.

When 'manually' (via the GCODE console) switching between tools, the scripts behave as expected although T1 seems to have issues occasionally. I've not managed to figure out a pattern to it yet.

Purge bucket sits at the end of the X carriage. The hotend is a shared nozzle with integrated 3 way split. Board is only configured for 2 extruders currently, but all 3 tool changing file sets (free, pre and post) are identical.

Ender 3 - Duet 2 Wifi with 2.02 Firmware

tfreeX.g:
M83 ; Relative E mode
G92 E0 ; Reset E
G1 E-6 F1500 ; Retract 6mm @ 25mm/s
G91 ; Relative moves
G1 Z1.2 F1000 ; Lift nozzle 1.2mm
G90 ; Exact moves
G1 X245 F6000 ; Move to PurgeBox
G92 E0 ; Reset E
G1 E-50 F3000 ; Retract 50mm
G92 E0 ; Reset E

tpostX.g:
M83 ; Relative E mode
G92 E0 ; Reset E
G1 E56 F3000 ; Extrude 56mm
G1 E30 F300 ; Purge 30mm to clear chamber
G4 P1000 ; Wait 1s
G92 E0 ; Reset E
G91 ; Relative moves
G1 Z-1.2 F1000 ; Lower nozzle 1.2mm
G90 ; Exact moves
G1 X225 F6000 ; Wipe 1
G1 X245 F6000 ; Wipe 2