How to set delay for Duet Wifi and 240V silicone heat bed?



  • After upgrading bed heater from 12V to silicone 240V (from "Keenovo") I have a problem: before it took about 15 minutes to heat to 100+ degrees, now it is several seconds before bed thermistor reports 100C (optical thermometer shows about 20-30 less at that moment) and about 5+ minutes before I can see at least 98C with optical thermometer. E3D Volcano also heats up in no time to delay.
    Is there way to set something in Duet Wifi settings to add several minutes before actually printing?



  • While we wait for someone to come up with a propper answer you could have a macro that started the heaters on a wait for temp then moved the head around for a bit slowly to waste time before triggering a specific file name build.



  • @DocTrucker For now I'm turning on bed heater in web interface, waiting and uploading job when surface temperature near required (about 5 minutes for ABS 100C).


  • Moderator

    You could add a G4 dwell command to the slicer start gcode to wait for temps to stabilize.

    Alternatively, you could use a higher setpoint temp for the first layer such that the actual surface temp is your desired temp and then the second layer temp could drop to maintain your normal print bed temp.



  • @VladimirK
    So my bodge would look something like:

    G10 P0 S210 ;Change to suit tool temp and number.
    T0
    M140 S100; Change to suit bed temp.
    M116 ;Waits for temps
    G1 X0 Y0 Z5 F6000
    G1 X60 F60
    G1 X0
    G1 X60
    G1 X0
    G1 X60
    G1 X0 F6000
    M23 BuildToStart.gcode
    M24

    Edit: adjust coordinates to avoid colisions if needed.



  • Yup, G4 in slicer start gcode a much better solution! 😄

    https://duet3d.dozuki.com/Wiki/Gcode#Section_G4_Dwell



  • @DocTrucker Was watching gcode produced by Cura before custom "Start G-code", there are
    M140 S110
    M105
    M190 S110
    M104 S240
    M105
    M109 S240
    M82 ;absolute extrusion mode

    The problem is filament will burn at 240 in hotend (become brown) if I'll put G4 S300 (5 minutes) here. Can I change somewhere in Cura to make
    M140 S110
    M105
    M190 S110
    G4 S300
    M104 S240
    ?



  • set this code:

    M140 S110
    M105
    M190 S110
    G4 S300
    M104 S240
    

    in your start g-code and cura take this code to heat your printer


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