Heater can't keep temperature up



  • Hi, I am having trouble keeping the temps constant. As soon as they drop to .99 I get this :
    Warning: Tool 0 was not driven because its heater temperatures were not high enough or it has a heater fault
    I did an auto PID tuning twice and saved it, but the heater just can't keep up and I don't know how to boost it up.
    Also while the test print job runs I have no control over my cooling fan. So I can't lower it to test if it is too high.
    Normally I can set it to run at whatever percentage I want, but not while it prints?
    Duet WiFI
    The printhead is a Titan Aero with just the cooling fan.

    This is my config:
    ; Configuration file for Duet WiFi (firmware version 3)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.8 on Thu Jan 30 2020 16:44:56 GMT+0200 (Eastern European Standard Time)

    ; General preferences
    G90 ; send absolute coordinates...
    M83 ; ...but relative extruder moves
    M550 P"QB" ; set printer name

    M667 S1 ; select CoreXY mode

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

    ; Drives
    M569 P0 S0 ; physical drive 0 goes backwards
    M569 P1 S1 ; physical drive 1 goes forwards
    M569 P2 S1 ; physical drive 2 goes forwards
    M569 P3 S1 ; physical drive 3 goes forwards
    M584 X0 Y1 Z2 E3 ; set drive mapping
    M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
    M92 X80.00 Y80.00 Z500.00 E420.00 ; set steps per mm
    M566 X900.00 Y900.00 Z900.00 E120.00 ; set maximum instantaneous speed changes (mm/min)
    M203 X18000.00 Y18000.00 Z1800.00 E1200.00 ; set maximum speeds (mm/min)
    M201 X3000.00 Y3000.00 Z20.00 E250.00 ; set accelerations (mm/s^2)
    M906 X2000 Y2000 Z2000 E700 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 X500 Y500 Z500 S0 ; set axis maxima

    ; Endstops
    M574 X1 S1 P"!xstop" ; configure active-low endstop for low end on X via pin xstop
    M574 Y1 S1 P"!ystop" ; configure active-low endstop for low end on Y via pin ystop
    M574 Z1 S1 P"!zstop" ; configure active-low endstop for low end on Z via pin zstop

    ; Z-Probe
    M558 P0 H5 F120 T6000 ; disable Z probe but set dive height, probe speed and travel speed
    M557 X15:215 Y15:195 S20 ; define mesh grid

    ; Heaters
    M140 H-1 ; Disable heated bed
    M308 S1 P"e0temp" Y"thermistor" T100000 B4138 ; 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
    M143 H1 S280 ; set temperature limit for heater 1 to 280C
    M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit

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

    ; Tools
    M563 P0 D0 H1 F0 ; 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

    ; Custom settings are not defined

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

    M501

    and the override config file

    ; config-override.g file generated in response to M500 at 2020-02-02 18:34
    ; This is a system-generated file - do not edit
    ; Heater model parameters
    M307 H0 A340.0 C140.0 D5.5 S1.00 V0.0 B0
    M307 H1 A662.8 C268.2 D8.4 S1.00 V12.0 B0
    ; Workplace coordinates
    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


  • Moderator

    @id104335409 said in Heater can't keep temperature up:

    I have no control over my cooling fan

    Which cooling fan do you mean? The heatsink fan or the part cooling fan?

    The heatsink fan is configured to be controlled thermostatically based on the temp of the heater, so once above 45c it will be on full power.

    The part cooling fan should show up as a slider in DWC and should be controllable. It's a good idea to set the part cooling fan during the PID tuning to be at the same speed you would normally be using for an actual print.



  • there is only one fan - the heatsink fan, but the problem is heating is not turning on and off in a way that keeps the head above the printing temperature and if it drops by 0.1 degree it just refuses to push filament so not to cause jams. the fan should be at 100% anyway, but I was surprised to see the slider didn't control it anymore.


  • Moderator

    What temp are you trying to reach? What does the graph look like?



  • 100 degrees, graph is straight line. Dips are just down from 100 to 99.99.
    otherwise I can go up 225 I believe. Temperature is not an issue.



  • @id104335409 , are you trying to extrude filament at 100C ???? That will not work as your temperature is too low.
    The ' tool not driven ' error message only shows up if you are trying to extrude.
    You are saying you can reach 225C and temperature is not an issu so why are you testing things at 100C ... try testing at 200C instead.



  • Oh, Im so sorry - this is just a test run , no need for filament all over the place. I'm just adjusting the printer.
    Heater, sensor, e steps, bed level and so on.
    Is there a failsafe that doesn't allow extrusion under certain temperature?



  • @id104335409 Yes there is. But you can use M302 to allow cold extrusion.


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