Cura generated g-code produce stuttering on inner walls

[xDmSx 0]

Cura generated g-code produce stuttering on inner walls of cylinder with 3 perimeter walls. No stuttering in Slic3r with same parameters. Wall order optimization have no impact. Linear and less curvy objects don't have this problem objects.

Printer: Anet A6 (TATARA frame)

Video #1

Video #2

 

Edited May 12, 2019 by xDmSx

[burtoogle 516]

Hello @xDmSx, please save the project (File -> Save) and attach the .3mf file to this thread. Thanks.

[burtoogle 516]

Oh, and can you also please attach the gcode file. Thanks.

[xDmSx 0]

I don't know if Cura is to blame (so topic might not be relevant). Downloaded CraftWare and it produced similar result (Have not much experience with it) . But Slic3r still make no problems. Just can't understand why outer walls are fine and inner stutter even with same speed-acceleration  settings. 
I uploaded some different project. It has same speeds for walls, but still stutter near smaller radius.

EllipseBench v1.3mf EllipseBench v1.gcode

[burtoogle 516]

Hello @xDmSx, I suggest that you enable the Optimize Wall Printing Order setting (if not already enabled) and also set Minimum Wall Flow to something like 20.

[cagriahiskali 1]

I have the same layer skips in Cura4.. Slic3r does not make this skips..

[xDmSx 0]

I don't know why under-extrusion occurs. Now I just wondering why inner wall prints with noticeable stutter, while outer walls smoothly with same speed-accel-jerk settings.

[cagriahiskali 1]

When starting a new layer, sometimes it skips 1 thread. And that causes the layer skips as shown. Slicer and older Cura (before 3,6) does not make these things..

[xDmSx 0]

 

I think under-extruded lines happens in my "ring bench" because of pressure drop and leaking of some filament during strange move nozzle make above already printed inner wall area. If I set Z-seam to be at one position (not random) it can be clearly seen. Under-extruded lines right at outer wall start, not at layer change!

I have 0.6mm nozzle, and ring wall is 1.8mm. Cura 3.6. Same with version 4.0.

Look at simulation video. You can see nozzle moves around green line 2 times - 1 when printing and 1 when travel to start of outer (red) wall! But speed is same, not as travel (I can see it while printing), so is it not a travel move?

Whichever settings I change I can't get rid of this useless move. e.g. Combing, Line Width, Do not print thin walls etc.

 

Edited May 16, 2019 by xDmSx

[burtoogle 516]

On 5/14/2019 at 1:02 PM, burtoogle said:

Hello @xDmSx, I suggest that you enable the Optimize Wall Printing Order setting (if not already enabled) and also set Minimum Wall Flow to something like 20.

 

@xDmSx, two days ago, I suggested that you set the Min Wall Flow to a lowish value. Did you try that? I think it solves the problem of printing walls that are an odd number of lines thick.

[burtoogle 516]

Sorry, my mistake it needs to be a higher value than that, probably 50 would be OK.

 

[xDmSx 0]

Thank you, @burtoogle. That thing worked. And now pipe came out with acceptable quality without much holes in shell 😊, just needs some little tweaks. Additional movement over inner wall was removed. Haven't notice these parameter before.

 

But my original problem was jerky movement on inner wall and it still remains, but not produce major impact on print quality now.

So I will leave it as it is for now.

Edited May 16, 2019 by xDmSx

[cagriahiskali 1]

Hi Guys,

Finally I fixed the problem. Here is why its happening..