Cura 5.4.0, help needed for "only one perimeter", where to find this setting?

[hoeby 0]

I am looking for the "only one perimeter" setting for top and bottom layer.

 

It is discust in this github issue and should be released on 4.20.4

I am on stable 5.4.0, but can't find this option.

see https://github.com/Ultimaker/Cura/issues/13080

 

Does somebody know how to do the "only one perimeter" setting in the last stable?

 

[Slashee_the_Cow 272]

That option was implemented by smartavionics in their fork (they took the code and used it to make their own version) of Cura. It doesn't exist in main Cura releases.

 

You can emulate it at the expense of part strength by changing Top/Bottom > Extra Skin Wall Count to 0 and Walls > Wall Line Count to 1, but that will result in the entire print only having one wall, which will make it significantly weaker.

[hoeby 0]

Thanks for your response.

 

Now i see it. The github question was on the ultimaker part. But the solution is in the fork. 

 

To go to 1 wall count for the entire part is no option. 

[Slashee_the_Cow 272]

You could mitigate it a bit by using Infill > Extra Infill Wall Count, but those are printed using the infill settings, so they're not as strong.

 

What I would do is get a little down and dirty (not too dirty, actually) into the g-code, assuming your model has a flat top surface on the top layer for the whole model.

1. Slice it with it normal settings and save the g-code
2. Slice it with only a single wall and save it into a different file
3. Open up both g-code files. Cura adds comments to the files at the start of each layer, like ;LAYER:64
4. Go to the bottom of the g-code files (the top layers come last). Scroll up (or just use a search function) until you find the comment indicating the start of the top layer (the last ;LAYER comment in the file).
5. Select and copy the code from the "one line" file - if there's a section immediately above the layer comment that starts with ;MESH:NONMESH and only contains G0 commands, then select that too, otherwise just start at the layer comment. Select all the code from there to the end of the file and copy.
6. Go back to your "normally sliced" file and delete the code from the same point - either the layer marker or the nonmesh section before it - to the end.
7. Paste the code from the "one line" file at the end of the "normally sliced" file.
8. Now you have a file which is normally sliced until you get to the very top. Go print it. Hopefully it works.

Edited October 13, 2023 by Slashee_the_Cow

[hoeby 0]

On 10/13/2023 at 1:26 AM, Slashee_the_Cow said:

That option was implemented by smartavionics in their fork (they took the code and used it to make their own version) of Cura. It doesn't exist in main Cura releases.

 

You can emulate it at the expense of part strength by changing Top/Bottom > Extra Skin Wall Count to 0 and Walls > Wall Line Count to 1, but that will result in the entire print only having one wall, which will make it significantly weaker.

 

I used this setting, but added option "Extra infill wall count" and give the infill wall count the same flow settings as the wall settings. The printer is now running. Hopefully this is a compensation to get close to the "only one perimeter on top/bottom"

[Coizado 0]

Isn't it easier to just make a cube intersecting the top layer and set it to "Modify settings for overlaps" > "Cutting mesh" and select "Wall line count = 1" and "Extra skin wall count = 0"?

[Slashee_the_Cow 272]

7 hours ago, Coizado said:

Isn't it easier to just make a cube intersecting the top layer and set it to "Modify settings for overlaps" > "Cutting mesh" and select "Wall line count = 1" and "Extra skin wall count = 0"?

Using a cutting mesh is not an ideal solution because it makes it treat the area inside the modifier as essentially a separate model, meaning the model will have an extra layer of skin and that the top layer may not be connected as strongly. It may also create an ugly Z seam where it thinks it's moving from one model to the next. It can also get very fiddly if your model has top surfaces on different layers.

 

Also you're better off setting it to 0 wall line count and 1 extra skin wall count (and don't forget to disable "alternate extra wall" either way if you use that) because the fill pattern will overlap with a skin wall more than with a regular wall, creating a stronger and more visually consistent (as the lines merging with the skin wall will help to fill gaps, and the flow rate will never change) top layer:

 

 @Coizado, while it's great that you're offering helpful suggestions like this, please include instructions when you do. This isn't exactly a one click process and while I know exactly how to do it, a lot of readers won't.

And please post screenshots individually, not a composite as you have created, since the forum downscales them so much that combining them (especially side by side) results in a blurry mess where you can't see the important details. You may want to zoom out so you can see a large amount of the model at roughly the same size as the dialog box and line them up next to each other to get both the settings and result in a small area that resolution won't be lost (at least, not nearly as much) by the forum crushing it to save space.