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Holes at start & stop location of each layer

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Hello everyone,

I am trying to fine tune my ABS settings for my UM2. I print with:

0.7 nozzle

0.25 layer height

20 percent fill

260 degree head

90 degree bed

I set the speed and temperature to 80 mm/s in Cura, and always turn it down to 80% on my UM2.

I have the following problem (dont know the name for it):


I guess these dents are where one string starts and ends on each layer. What is the name for this problem and what can I do to avoid this?


Edited by Guest

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I keep having this problem on my other ultimaker too. I am using Cura to generate the gcode. Does anyone have other ideas I could try?

- printing at 70% speed didnt help

- printing at 240 degrees (instead of 260 degrees) also did not help

Blobs are always at the exact same location which other settings. I guess I need some other settings for the start and ending of a layer?



Edited by Guest

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Try to reverse the infill print order. So it prints the outside first, and the inside last, this should help to remove that Z scar because when it changes Z the hotend should be inside the print and not outside. S3D has an option to 'retract' while changing Z that in conjunction with wipe while retracting and combing makes the Z scar almost almost disappear.

1.9x new Cura beta has a combing option that should also help remove the amount of filament on the nozzle when it does the z change (to remove the blob). But it's beta so it's a complete different user interface etc.

Edited by Guest

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