No hotend reaction



  • Hi,

    I´m a beginner with 3D Printers. And now I have a serious problem with my Duet 0.8.5. When I want to switch on the hotend with pronterface, nothing is gonna happen. The LED which should light up also doesn´t show any reaction. The heat element (incl. wires) and the thermistor is working fine. I checked both of the hot end plugs and none of them is showing a voltage output.

    Cheers
    Nico



  • Hi Nico,

    It sounds like a configuration issue so post your config.g so that we know where to start looking. Also, it would help if you can tell us a bit about your printer, like is it a Cartesian or delta, how many extruders does it have, what voltage your power supply and heater are etc.. Just basic stuff to help us understand your problem.

    Ian



  • Hi Ian,

    I have a Kossel XL with only one extruder. I am using the dc42Kossel config:

    [; Configuration file for dc42 Kossel
    
    ; Communication and general
    M111 S0                             ; Debug off
    M550 PKossel		        		; Machine name (can be anything you like)
    M551 Preprap                        ; Machine password (used for FTP)
    M540 P0xBE:0xEF:0xDE:0xAD:0xFE:0x42 ; MAC Address
    ;*** Adjust the IP address and gateway in the following 2 lines to suit your network
    M552 P192.168.0.14					; IP address (0 = use DHCP)
    M554 P192.168.1.10                  ; Gateway
    M553 P255.255.255.0                 ; Netmask
    M555 P2                             ; Set output to look like Marlin
    M575 P1 B57600 S1                   ; Set auxiliary serial port baud rate and require checksum (for PanelDue)
    
    ; Axis and motor configuration
    M569 P0 S1							; Drive 0 goes forwards
    M569 P1 S1							; Drive 1 goes forwards
    M569 P2 S1							; Drive 2 goes forwards
    M569 P3 S0							; Drive 3 goes backwards
    M569 P4 S0							; Drive 4 goes backwards
    M574 X2 Y2 Z2 P1 S1					; set endstop configuration (all endstops at high end, active high)
    
    M665 L333 R213.5 H288 B150 X0 Y0	; set delta radius, diagonal rod length, printable radius, homed height and XY tower corrections
    M666 X0 Y0 Z0						; put your endstop adjustments here, or use auto calibration to find them
    M92 X160 Y160 Z160					; Set axis steps/mm (20 tooth pulleys, 0.9deg/step motors)
    M906 X1000 Y1000 Z1000 E800			; Set motor currents (mA)
    M201 X3000 Y3000 Z3000 E1000		; Accelerations (mm/s^2)
    M203 X18000 Y18000 Z18000 E3600		; Maximum speeds (mm/min)
    M566 X600 Y600 Z600 E600			; Maximum instant speed changes
    G21                                 ; Work in millimetres
    G90                                 ; Send absolute coordinates...
    M83                                 ; ...but relative extruder moves
    
    ; Thermistors and heaters
    M305 P0 T100000 B3950 R4700 H0 L0	; Typical Chinese bed thermistor. Put your own H and/or L values here to set the bed thermistor ADC correction.
    M305 P1 T100000 B4388 R4700 H0 L0	; E3Dv6 hot end. Put your own H and/or L values here if necessary to set the first nozzle thermistor ADC correction.
    M301 H0 P20 I0.5 D1000 T0.85 W150 B5 ; PID settings for the bed
    M301 H1 P10 I0.10 D100 T0.50		; PID settings for extruder 0
    M570 S200							; Allow extra heating time
    M106 P1 T45 H1						; Hot-End Lüfter beginnt erst bei 45°C
    
    ; Tool definitions
    M563 P0 D0 H1                       ; Define tool 0
    G10 P0 S0 R0                        ; Set tool 0 operating and standby temperatures
    M92 E420	                       	; Set extruder steps per mm for first and second extruders
    
    ; Z probe and compensation definition
    M558 P1 X0 Y0 Z0 H3 F300 T12000		; Z probe is IR and is not used for homing any axes, Z probe dive height 3mm, probing speed 300mm/min, travel speed 12000mm/min
    G31 X0 Y0 Z1.66 P500				; Set the zprobe offset and threshold (put your own values here). For a delta, use zero X and Y offset.
    
    ;*** If you are using axis compensation, put the figures in the following command
    M556 S78 X0 Y0 Z0                   ; Axis compensation here
    
    M207 S7.0 F3600 Z0.1				; Set firmware retraction details
    M572 D0 S0.1						; set pressure advance
    
    T0									; select first print head
    ]
    
    


  • Ok, I found the bug. I don´t know why that is so, but never mind. I changed the wire orientation of the thermistor and that was it. Is there any diode in the thermistor or why the orientation matters? I thought that a thermistor is a restistor with a almost linear restistance dependency to the temperature.



  • @QuickNick:

    Ok, I found the bug. I don´t know why that is so, but never mind. I changed the wire orientation of the thermistor and that was it. Is there any diode in the thermistor or why the orientation matters? I thought that a thermistor is a restistor with a almost linear restistance dependency to the temperature.

    I thought so too - it shouldn't matter which wire goes to which side of the thermistor. Maybe you have a bad connection somewhere which coincidentally got disturbed when you were swapping wires? I can't see anything obviously wrong with your configuration.


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