Hot end thermistor problem...again.



  • About two weeks ago, the hotend on my ender 3 (with Duet2 wifi) started reading 2000. I figured the thermistor went bad so I ordered some replacements and I finally have time to change it out. I didn't insert the (bead) thermistor into the heater block, I just plugged it into the board. Still reading 2000. To confirm that the new therm is good, I plugged it into the bed therm port on the board and it read fine. I've plugged them into both hot end thermistor ports with the same results. Do I have a bad board? Can I plug the thermistor into a different spot on the board?

    Thanks,
    Pat



  • Hi,

    If I understand your post you connected the new thermistor to all three ports on the board and it worked.

    Is that correct?

    Frederick



  • Thanks Frederick! I connected it to the bed port and it worked, but the two hotend therm ports read 2000.



  • @BearcatTD said in Hot end thermistor problem...again.:

    Thanks Frederick! I connected it to the bed port and it worked, but the two hotend therm ports read 2000.

    Ah... That's not how I read it. Good to know.

    Since both ports read the same it doesn't simply likely that they both would spontaneously fail at the same time.

    Perhaps something happened to the configuration settings for them. Did you have a config-override file that somehow got deleted?

    Post you config file here, please.

    Frederick



  • ; Configuration file for Duet WiFi (firmware version 1.21)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool on Thu Sep 06 2018 21:21:12 GMT-0700 (Pacific Daylight Time)

    ; General preferences
    G90 ; Send absolute coordinates...
    M83 ; ...but relative extruder moves

    ; Network
    M550 Pe3 ; Set machine name
    M552 S1 ; Enable network
    ;*** Access point is configured manually via M587
    M586 P0 S1 ; Enable HTTP
    M586 P1 S0 ; Disable FTP
    M586 P2 S0 ; Disable Telnet

    ; Drives
    M569 P0 S0 ; Drive 0 goes backwards
    M569 P1 S0 ; Drive 1 goes backwards
    M569 P2 S1 ; Drive 2 goes forwards
    M569 P3 S0 ; Drive 3 goes backwards
    M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
    M92 X80.00 Y80.00 Z400 E95 ; Set steps per mm
    M566 X1000 Y1000 Z100 E30000 ; Set maximum instantaneous speed changes (mm/min)
    M203 X6000 Y6000 Z500 E1500 ; Set maximum speeds (mm/min)

    M201 X300 Y300 Z100 E5000 ; Set accelerations (mm/s^2) was 500 you changed it to 300 for stall guard
    M906 X500 Y500 Z500 E1000 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S300 ; Set idle timeout

    ; Axis Limits
    ;M208 X-5.5 Y-10 Z0 S1 ; Set axis minima
    ;M208 X258.5 Y246 Z260 S0 ; Set axis maxima
    M208 X-106:114 Y-110:118 Z0:180

    ; Endstops
    M574 X1 Y1 S1 ; Set active high endstops

    ; Z-Probe
    M574 Z1 S2 ; Set endstops controlled by probe
    M307 H3 A-1 C-1 D-1 ; Disable heater on PWM channel for BLTouch
    M307 H4 A-1 C-1 D-1 ; Disable heater on PWM channel for BLTouch
    M558 P9 H2.5 F120 T6000 ; Set Z probe type to bltouch and the dive height + speeds
    G31 P25 X-31 Y0 Z3.06 . ; Set Z probe trigger value, offset and trigger height
    M557 X50:185 Y50:185 S65 ; Define mesh grid

    ; Heaters
    M305 P0 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 0
    M143 H0 S120 ; Set temperature limit for heater 0 to 120C
    M305 P1 X150 T"K" ; Set THERMOCOUPLE parameters for heater 1 X150 is the right channel (terminal block) on the daughterboard. X151 is the right channel.
    M305 P1 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 1
    M143 H1 S345 ; Set temperature limit for heater 1 to 345C

    ; Fans
    M106 P0 S0 I0 B0.5 F250 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P1 S1 I0 B0.5 F500 L255 H1 T45 ; Set fan 1 value, PWM signal inversion and frequency. Minimum Speed is 1/3 aka 87 Thermostatic control is turned on triggered at nozzle temp 45;
    M106 P2 S0 I0 B0.5 F500 H-1 ; Set fan 2 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 R0 S0 ; Set initial tool 0 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
    M591 D0 P5 C3 R10:300 E3.0 S1 ; Duet3D laser sensor for extruder drive 0 is connected to endstop input 3 (E0), tolerance 10 to 120%, 3mm comparison length



  • ; config-override.g file generated in response to M500
    ; This is a system-generated file - do not edit
    ; Heater model parameters
    M307 H0 A90.0 C700.0 D10.0 S1.00 V0.0 B1
    M307 H1 A340.0 C140.0 D5.5 S1.00 V0.0 B0
    M307 H2 A340.0 C140.0 D5.5 S1.00 V0.0 B0
    M307 H5 A340.0 C140.0 D5.5 S1.00 V0.0 B0
    M307 H6 A340.0 C140.0 D5.5 S1.00 V0.0 B0
    M307 H7 A340.0 C140.0 D5.5 S1.00 V0.0 B0
    G10 L2 P1 X0.00 Y0.00 Z0.00
    G10 L2 P2 X0.00 Y0.00 Z0.00
    G10 L2 P3 X0.00 Y0.00 Z0.00
    G10 L2 P4 X0.00 Y0.00 Z0.00
    G10 L2 P5 X0.00 Y0.00 Z0.00
    G10 L2 P6 X0.00 Y0.00 Z0.00
    G10 L2 P7 X0.00 Y0.00 Z0.00
    G10 L2 P8 X0.00 Y0.00 Z0.00
    G10 L2 P9 X0.00 Y0.00 Z0.00



  • Hi,

    Well that is a bit confusing.

    How did config-override get generated? Was it a result of heater tuning?

    And you mentioned a thermistor but in the config file there is a command for a thermocouple.

    So what exactly are you using?

    Thanks.

    Frederick



  • I don't know how it was generated. The thermistor is just one of the small "bead" pieces. These are what I ordered: https://www.amazon.com/gp/product/B0150YLX9C/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1



  • Would it just be easier to start over with a new config file?!



  • @BearcatTD said in Hot end thermistor problem...again.:

    M305 P1 X150 T"K" ; Set THERMOCOUPLE parameters for heater 1 X150 is the right channel (terminal block) on the daughterboard. X151 is the right channel.

    try deleting this line and restarting the printer.

    also B4138 is incorrect for the ender 3.
    see the guide about the correct ender 3 setup.
    https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+1:+Wiring/37



  • @BearcatTD said in Hot end thermistor problem...again.:

    Would it just be easier to start over with a new config file?!

    No I don't think you need to do that.

    You have run heater tuning at some point correct?

    Frederick



  • Changing the M305 and the thermistor number seemed to work! Thanks all!



  • Not entirely sure how those settings got changed originally though...



  • @BearcatTD said in Hot end thermistor problem...again.:

    Changing the M305 and the thermistor number seemed to work! Thanks all!

    Glad to hear you got it working.

    As to the heater tuning question I posted - have you run heater tuning at some point in the past?

    Frederick


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