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DHQidiTech1

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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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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