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lordnimon

Difference between skin, shell, and walls?

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Posted (edited) · Difference between skin, shell, and walls?

What is the difference among these three terms?  Under "Infill" settings, I can set the "infill overlap" and "skin overlap" percentages.  Under "Shell" settings, it talks about Wall overlaps.  Skin overlap defaults to 5% and 0.02mm -- why both settings?  Don't they conflict?  And why does infill overlap default to 0?  Shouldn't it also be 5%

Edited by lordnimon

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Posted · Difference between skin, shell, and walls?

The skin are the topmost layer, so the "skin overlap" is the overlap between the wall of these layers and their filling.

The "infill overlap" is the overlap between the wall and the infill, i.e. inside the object/ below the skin.

In the shell section you talk about, there is the setting for wall overlap compensation. This is for reducing the extrusion in areas where the print head has to go over twice while printing the wall. (see ttps://ultimaker.com/en/resources/20415-shell)

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Posted · Difference between skin, shell, and walls?

It would be nice for Cura settings to use consistent terminology...

 

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Posted · Difference between skin, shell, and walls?

Speaking about Bridges, is "skin" the first (the lowest) layer of the bridge?

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Posted · Difference between skin, shell, and walls?

The only part that is really inconsistent is the Line Type - Color Scheme legend (also the Skin Overlap settings should be in the Shell catagory I guess.)

 

Concerning the settings (not the Line Type as shown in Preview):

 - Shell is all outer parts / (near the) outside of the model.

 - Walls are the vertical (enough) parts of the shell, and thus part of the shell. (They're red and green in the preview.)

 - Skin is the horizontal parts of the shell, and also part of it. Not just the top, but also the bottom! Yes, this also means that the lowest layer of a bridge is skin.

 

This also (sort of) answers the questions (together with the hover-over explanations), Shell is the catagory, there the wall-overlap settings are for walls overlapping _each other_. In the Infill catagory, there is the infill overlap settings, which handles the overlap between the infill and the walls. Then there's (also in the Infill catagory, which it probably shouldn't) the skin overlap settings, which handle overlap between wall and skin (since the walls take precendence over skin, unless you set the nr. of walls to 0, there's going to be walls on each layer there's skin as well).

 

There is a default skin overlap to make the shell look a bit better, but that's normally not needed for the infill (though 'looking better' is not the only reason you could want overlap).

 

As an aside, in the 'Color Scheme' legend in the Line Type menu of the Preview screen:

 - It says 'Shell' here, but it's really just the outer wall that's red.

 - It says only top/bottom and infill is yellow (infill will be orange from 4.2 onwards b.t.w. ... or more orange I sould say since it already was a _slightly_ different shade of yellow. Also support interface will be darker blue than the rest of support.) but due to technical reasons, wall-filling (not to be confused with infill) is also yellow. Wall filling is used when a wall can not be made thicker, and there's still a gap to the next wall that should also be part of the wall and not infill.

 

P.S. What is 'outside' or 'close to outside' can be a bit counterintuitive sometimes though. There are cases where skin shows up in what can be argued is the middle of the model. Let's not get into that since it requires me to make drawings, and this is already taking quite long.

 

P.P.S.: Thanks for the question, it revealed two hopefully easy to fix issues. (Unless there are _reasons_ I'm unaware of, which tends to happen as well.)

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