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Spitting out blobs at the start of each layer


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Posted · Spitting out blobs at the start of each layer

I think I might have changed profile to cause this and I'm curious what it might be.


I have an Ender 3 V2 with Jyers firmware.


Between layers, the printer retracts a bit of filament, moves to the start of the next layer, pushes the filament back in... and then just sits there for a couple seconds, before starting to move for the layer. The result is a blob of plastic at the same point in every layer, which adds up to a bump over time.


Here's an example of some gcode around a layer transition:

G1 F1148.9 X118.422 Y80.035 E271.18411
G1 F2700 E266.18411
G0 F300 X118.422 Y80.035 Z0.6
G0 F7500 X118.207 Y108.056
G0 X117.122 Y108.056
G0 X107.269 Y107.322
G0 X104.322 Y107.31
G0 X104.322 Y108.056
M106 S170
G1 F2700 E271.18411 ;<--- I think it pauses here
G1 F1500 X104.322 Y110.727 E271.27295
G1 X106.536 Y111.836 E271.35531
G1 X106.536 Y109.163 E271.44421
G1 X106.536 Y108.056 E271.48103
G1 X104.322 Y108.056 E271.55467
G1 F2700 E266.55467
G0 F9000 X104.322 Y107.31


The extruder wheel moves and then stops, at which point I'd expect it to start with the next line and start moving, but instead it just sits there for a few seconds.

Any ideas?

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    Posted · Spitting out blobs at the start of each layer

    Hey @Computerizer,


    Welcome to the Ultimaker Community 🎉
    I believe you are experiencing a bad Zseam.

    There are settings in Cura you can change to improve your zseam.

    You can define the placement by looking for the white dots in your preview.
    You can have Cura define the Z seam alignment and even have a Seam Corner Preference.

    You can also start tuning Retract, Wipe or even Coasting settings. 

    Do you have a picture and a project file of what you are seeing?

    To save a project file go to File -> Save project.

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