What is G92 used for in G-code

  • On the reprap wiki it says using Znnn it sets a new axis position. But then it says "No physical motion will occur". What would the line G92 E0 be used for?

  • Mick

    Mick Correct answer

    3 years ago

    The G92 command is used to set the start position (origin) of one of more axes (including the current extruder) to any arbitrary value. The command G92 E0 is often used to perform retraction and nozzle priming. For example, the following commands are often used in start-gcode sequences (prologues) to prime the current extruder by extruding a small amount of filament:

    G92 E0     ; Reset the extruder's origin
    G1 F200 E3 ; Extrude 3 millimetres of filament
    G92 E0 ; Reset the extruder's origin

    RepRap Wiki: G92: Set Position

    But what does it mean to reset the extruders origin? What would happen if you did the “G1 F200 E3” without first resetting the extruders origin? G92 makes perfect sense for x, y, and z, but can’t wrap my head around it for the extruder.

    @Michael Why, it is exactly the same. Maybe you should not read it as "reset", but as "set" instead. From the top of my head I don't know what is taken when you omitted the first `G92 E0`, I assume it will start at zero anyways. But, it sets the filament extrusion to a certain length to zero, after priming it makes perfect sense to set the length to zero. Slicers (some) set the length back to zero after completion of a print layer, this prevents very large values for the filament length.

    Hi @Michael , thanks for your question, as I was thinking the same thing. However, as you're probably aware, questions (even good questions like yours) shouldn't be in comments. Could you post your question as a new question (referring back to Mick's answer - as it is the source of your query), and then Davo's answer below would make more sense there... if you see what I mean? :-)

    @Greenonline my question would make no sense as its own question. It only makes sense in the context of this answer.

    @Michael That is exactly why you should refer to this answer! The context can be found through the reference, this is not uncommon, this has happened more often. Sometimes answers spawn other questions.

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Content dated before 7/24/2021 11:53 AM

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