First Test Print following Duet3d Upgrade



  • @phaedrux I did not set M501 at the end of config.g. I have now.

    I have just re-run the PID tuning on both the heated bed and the extruder. The bed had not changed a whole lot from yesterday. I re-ran the Extruder PID auto-tune 4 times and it changed every time (I still don't understand why it doesn't appear to cycle the 8 times I ask for in in the auto-tune instruction).

    When retesting the Extruder temp is still going over by 5-6 Degrees.

    I'm going to plug in the last set of results to config. and look at @dc advice on fine tuning;

    Quote;
    "If the temperature oscillates around the target value, increase the dead time (D) parameter. It it's slow to respond to changes in the environment (e.g. the print cooling fan turning on), you can try reducing the D parameter.

    If the temperature overshoots, increase the gain (A parameter). If it undershoots, reduce the A parameter."

    These are my latest Heater settings;

    ; Heaters
    ; Bed [H0 - Heater 0]
    M143 H0 S70 ; Set temperature limit for heater 0 to 70C
    M305 P0 T100000 B3988 R4700 ; Set thermistor + ADC parameters for heater 0
    M307 H0 A114.0 C410.3 D2.7 S1.0 V12.3 B0 ; PID Auto-tune Values for Bed [H0]

    ; Extruder [H1 - Heater 1]
    M143 H1 S245 ; Set temperature limit for heater 1 to 245C
    M305 P1 T100000 B3988 R4700 ; Set thermistor + ADC parameters for heater 1
    M307 H1 A376.3 C154.7 D9.4 S1.0 V12.4 B0 ; PID auto-tune Values for Extruder [H1]



  • @phaedrux said in First Test Print following Duet3d Upgrade:

    It kind of sounds like the heater either got turned off. Did you happen to notice what the temperature was or what the temp graph looked like?

    I did not, however, I only looked away for no more than 3 minutes and I have my max temp set to 245 Degrees. The first layer should have been 240 and it's been fluctuating up to 6 Degrees. But it's a fair point, it could have hit that max mark.



  • @b0m0a0k said in First Test Print following Duet3d Upgrade:

    (I still don't understand why it doesn't appear to cycle the 8 times I ask for in in the auto-tune instruction).

    It sounds like you might be looking at instructions for Marlin? I don't think reprapfirmware will do it that way.

    You'll get the best results if you run it from a cold state. i.e. when it's at room temp. And you really only need to run it once. If you run it multiple times in succession it's going to be warmer and will get different results.

    So try again from a cold state and see how that goes before modifying any parameters.



  • @phaedrux Good advice, thanks - I'll do that (the "from cold" thing).

    Thanks for clarifying the PID auto-tune operation, it's valuable to know that theres a difference between Marlin and RepRap when using this. I will limit my expectations accordingly 😉



  • This would be the best resource for PID tuning on RepRap. https://duet3d.dozuki.com/Wiki/Tuning_the_heater_temperature_control



  • For anyone else trying to print this temperature tower and wondering where to put the M104 markers I have worked them out to be in the following layers;

    ;LAYER:5 ;M104 S240
    ;LAYER:23 ;M104 S235
    ;LAYER:40 ;M104 S230
    ;LAYER:58 ;M104 S225
    ;LAYER:75 ;M104 S220
    ;LAYER:93 ;M104 S215
    ;LAYER:110 ;M104 S210
    ;LAYER:128 ;M104 S205
    ;LAYER:145 ;M104 S200
    ;LAYER:163 ;M104 S195
    ;LAYER:180 ;M104 S190
    ;LAYER:198 ;M104 S185
    ;LAYER:215 ;M104 S180

    This is based on a layer height of 0.4 and a filament of 1.75



  • That'll depend on what layer height you're printing at.


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