Bug G92 E0



  • Hey guys,

    I have a dual extruder setup. I was at first just using the first Extruder and everything was working fine. Now I switched to the second one and right before a print starts, the extruder is doing a huge retraction. I changed no start g-code what so ever.
    When I prime the extruder manually the Extruder position != 0. Now I wanted to set the extruder position to 0 with G92 E0. But no drive is set to 0 (even if the corresbonding tool is active). Only if I set another axis to Zero e.g. G92 Z0 or G92 X0 the Drive 0 and Drive 1 is jumping to zero aswell.

    Any advise?

    Printer: custom delta
    FW: 2.02RC5(RTOS) (2018-11-28b1)
    Slicer: Cura 3.6

    Edit: Now when I set Z to 0 (before I put G92 E0) the drives are set to zero aswell



  • Edit: Its even more strange.

    why is cura all of the sudden putting a retraction in the G-code?

    ;FLAVOR:RepRap
    ;TIME:903
    ;Filament used: 0m, 1.3913m
    ;Layer height: 0.2
    ;Generated with Cura_SteamEngine 3.6.0
    T1
    M82 ;absolute extrusion mode
    M190 S75
    M109 S220
    G28

    M83 ;relative extrusion mode
    G1 F7200 E-1
    ;LAYER_COUNT:101
    ;LAYER:0
    G1 F1200 E-15
    T1
    M109 S220
    M107

    And it is just doing that, when I put the Model on Extruder 2

    On Extruder 1 everything is fine:

    ;FLAVOR:RepRap
    ;TIME:1356
    ;Filament used: 1.42583m, 0m
    ;Layer height: 0.2
    ;Generated with Cura_SteamEngine 3.6.0
    T0
    M82 ;absolute extrusion mode
    M190 S75
    M109 S225
    G28

    M83 ;relative extrusion mode
    G1 F7200 E-1
    ;LAYER_COUNT:101
    ;LAYER:0
    M107
    G0 F15000 X-8.991 Y47.4 Z0.2



  • Upgrade your firmware to 2.04. Release candidate is no longer supported when the full release is issued.

    3.6 is a quite old version of cura by now as well...

    Do you have cura set to use relative extrusion?



  • Never change a running system 😉 -- I will switch to 2.04 as soon as I find the time to do it proper ( I know its a lazy excuse but I want to read at least the release notes and the change log to know the new features)

    3.6 ist the last one without the new interface (which I really don't like)

    Yes its set to relative extrusion. (I actually can't remember if i put it that way). What is recommended?

    After some more digging I found a clue:
    https://github.com/Ultimaker/Cura/issues/3849

    There is a default retraction on tool change I will switch that one to zero



  • Ah yes, the new interface takes some getting used to. There are a few plugins that make it behave more like the old style that make it not so bad.

    Relative extrusion is preferred.


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