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Extra Retraction at Start


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Posted · Extra Retraction at Start

Can someone explain why I am getting an extra retraction command right before my skirt starts? When I print, the filament doesn't print for sometime because of the extra retraction. I have tried it in both 3.4.1 and 3.5. Maybe I have a setting that is checked or set wrong. Below is my gcode from 3.5.0

 

;FLAVOR:RepRap
;TIME:966
;Filament used: 0m, 0.239212m
;Layer height: 0.1
;Generated with Cura_SteamEngine 3.5.0
T1
M190 S60
M104 T1 S200
M109 T1 S200
M82 ;absolute extrusion mode
;Start G-code ----------------------------------------------
G28 ;Home

;Prime the extruder
G92 E0
G1 E3 F200
G92 E0
;Start G-code ----------------------------------------------
M83 ;relative extrusion mode
G1 F1500 E-6.5
;LAYER_COUNT:18
;LAYER:0
G1 F1200 E-9.5       <<<<<<<<<<<<<<<<<<<------------------- Here is the extra retraction ------------------------------ 
T1
M107
G0 F3600 X96.903 Y65.048 Z0.3
;TYPE:SKIRT

 

I have also attached the project file.

XYZ_nickel_Calibration.3mf

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    Posted · Extra Retraction at Start

    Hi @DHQidiTech1, it is caused by the nozzle switch retraction distance being set to 16 in your profile. If I set it to 0 then you get the following:

    ;Start G-code ----------------------------------------------
    G28 ;Home
    
    G92 E0
    G1 E3 F200
    G92 E0
    M83 ;relative extrusion mode
    G1 F1500 E-6.5
    ;LAYER_COUNT:18
    ;LAYER:0
    G1 F1500 E6.5
    T1
    M107
    G0 F3600 X96.903 Y65.048 Z0.3
    ;TYPE:SKIRT
    G1 F1800 X97.404 Y64.385 E0.01563

    The retraction/prime now cancel each other out.

     

    Whether this is a bug or just the normal expected behaviour I cannot say as I only have experience with single extruder printers.

     

    Hope this helps.

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    • 6 months later...
    Posted · Extra Retraction at Start
    On 10/12/2018 at 3:09 PM, smartavionics said:

    Hi @DHQidiTech1, it is caused by the nozzle switch retraction distance being set to 16 in your profile. If I set it to 0 then you get the following:

     

    That seems to be the default, and this explains why I always wind up with the skirt line dragged into the model (UM3 Fast PLA config attached)

    image.png.09a185c05e5f40455c14f41a68bf5489.png

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    Posted (edited) · Extra Retraction at Start
    On 10/13/2018 at 1:09 AM, burtoogle said:

    Hi @DHQidiTech1, it is caused by the nozzle switch retraction distance being set to 16 in your profile. If I set it to 0 then you get the following:

    
    ;Start G-code ----------------------------------------------
    G28 ;Home
    
    G92 E0
    G1 E3 F200
    G92 E0
    M83 ;relative extrusion mode
    G1 F1500 E-6.5
    ;LAYER_COUNT:18
    ;LAYER:0
    G1 F1500 E6.5
    T1
    M107
    G0 F3600 X96.903 Y65.048 Z0.3
    ;TYPE:SKIRT
    G1 F1800 X97.404 Y64.385 E0.01563

    The retraction/prime now cancel each other out.

     

    Whether this is a bug or just the normal expected behaviour I cannot say as I only have experience with single extruder printers.

     

    Hope this helps.

    Hi @burtoogle

     

    If printer has 1 head the parameter you are talking about is hidden by system. Checkbox doesn't work to show it. Do hidden parameters affect g-code? Cause I have same issue with retraction at start. Any clues how to unhide it to make zero?

     

    Edited by airdox
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    Posted · Extra Retraction at Start

    I also have your same problem and i also can't select that option for the same reason, is there a way to fix this?

    btw i'm new, so sorry if i'm saying stupid shit

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    Posted · Extra Retraction at Start

    I had the same issue, but managed to figure out how to un-hide it. You need to modify the printer settings temporarily to have more than one extruder. Once it's set to 2, it will show the settings mentioned above so you can edit them finally, then afterward, just change the settings back to only having 1 extruder.

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