Printing the same part multiple times let small blobs exactly in the same places

[alexandreberg]

Hi I printed these parts and it got external layer marks (small blobs) exactly in the same pattern and in the same place.
I suppose the problem is in the g-code.
Does this is some configuration issue?
You can see the print results in the images attached as the g-code that I have used.
I am printing with 0.8mm nozzle.
Printer Creality Ender-3

Does anyone have an idea of this issue?

Thanks

Alexandre Nuernberg

This is the config summary the full g-code is attached:

material PET-G
; extruderDiameter,0.8
; extruderAutoWidth,1
; extruderWidth,0.96
; extrusionMultiplier,0.85
; extruderUseRetract,1
; extruderRetractionDistance,5
; extruderExtraRestartDistance,0
; extruderRetractionZLift,0
; extruderRetractionSpeed,2400
; extruderUseCoasting,0
; extruderCoastingDistance,0.35
; extruderUseWipe,0
; extruderWipeDistance,0.3
; primaryExtruder,0
; layerHeight,0.64
; topSolidLayers,3
; bottomSolidLayers,3
; perimeterOutlines,2
; printPerimetersInsideOut,1
; startPointOption,2
; startPointOriginX,0
; startPointOriginY,0
; sequentialIslands,1
; spiralVaseMode,0
; firstLayerHeightPercentage,100
; firstLayerWidthPercentage,150
; firstLayerUnderspeed,0.4
; infillExtruder,0
; internalInfillPattern,Rectilinear
; externalInfillPattern,Rectilinear
; infillPercentage,30
; outlineOverlapPercentage,50
; infillExtrusionWidthPercentage,100
; minInfillLength,1
; infillLayerInterval,1
; internalInfillAngles,45,-45
; overlapInternalInfillAngles,0
; externalInfillAngles,45,-45
; generateSupport,1
; supportExtruder,0
; supportInfillPercentage,45
; supportExtraInflation,0.6
; supportBaseLayers,0
; denseSupportExtruder,0
; denseSupportLayers,2
; denseSupportInfillPercentage,75
; supportLayerInterval,1
; supportHorizontalPartOffset,0.6
; supportUpperSeparationLayers,1
; supportLowerSeparationLayers,1
; supportType,0
; supportGridSpacing,2
; maxOverhangAngle,45
; supportAngles,0
; temperatureName,Primary Extruder,bed
; temperatureNumber,0,0
; temperatureSetpointCount,1,1
; temperatureSetpointLayers,1,1
; temperatureSetpointTemperatures,240,65
; temperatureStabilizeAtStartup,1,1
; temperatureHeatedBed,0,1
; fanLayers,1
; fanSpeeds,0

[S3D-Alex]

This looks to be what we call bobs and zits. These defects are caused by the start/stop points your nozzle makes during print moves. We have a great section of our Print Quality Guide that covers this topic in detail so I have included a link below. Please let me know if you still have issues with these!

https://www.simplify3d.com/support/prin ... s-and-zits

[alexandreberg]

Thanks, I gonna take a look in the post.