Z-banding (Not Z-wobble, because Delta)...the saga continues

[0110-m-p]

Mikk,
take a simple geometrical object (any cube will do).
Set "number of loops" to 1.
Set skin thickness to double of your extrusion width.
You will get a perimeter line PLUS a solid path that tries to get desired wall thickness
Therefore SKIN is really meant to be the thickness of ANY surface.

Wow Davide, really???

I always thought the same thing. Wall thickness was raw perimeters based on extrusion width and number of perimeters, while skin thickness was just the thickness of the bottom and top solid infill. If this is the case then extrusion width and skin thickness all need to be multiples of layer height to eliminate any rounding errors.

I'm in the middle of a 10hr print right now (using Cura...sorry) so I can't test this theory, but if someone else can confirm that would be awesome!

[Davide Ardizzoia]

Do note that in a perfect world you *should* make sure that your skin thickness = number of loops x extrusion width.

My example in previous post forces KS to draw a tight zigzag path (fascinating to see BUT a waste of time) that is absolutely not the leanest way to do things.

Best Regards
Davide Ardizzoia

[Mikk36]

Mikk,
take a simple geometrical object (any cube will do).
Set "number of loops" to 1.
Set skin thickness to double of your extrusion width.
You will get a perimeter line PLUS a solid path that tries to get desired wall thickness
Therefore SKIN is really meant to be the thickness of ANY surface.

best regards
Davide Ardizzoia

I guess it would be then. I haven't set the loops to be less width than skin thickness is yet.
In his case though, 0.48 * 3 = 1.44, meaning that his skin thickness was always less than the loops setting provides, so it shouldn't matter.
Either way, I haven't experienced any such banding on my delta with Kisslicer. I run the extrusion width at nozzle diameter.

[PenskeGuy]

Thanks for the extra shots. Still haven't answered whether the printed layers grow/shrink or oscillate.

In the close overhead shot, I can see that the Loops have gaps between them. Something in the flow computation needs adjustment. Walls should be solid.

Yes, Skin Thickness controls all exterior walls. I've wanted Loop walls and Infill walls to be separate for a long time.

One thing to note is that settings in one slicer are not useable in another. It may seem the thing to do but they all do things differently, unless of course they are yet another frontend for Skeinforge.

I would be interested in slicing that part to see if the paths are not coincident.

[0110-m-p]

So I'm trying another large part with these tweaks....

Layer Thickness: 0.22mm
Extrusion Width: 0.44mm
Skin Thickness: 0.88mm
Number of Loops: 2

and also Flow Adjust - Min: 0.01

This should at least rule out any errors from the non-common denominator rounding.

[0110-m-p]

So I was in a rush this morning when I checked out the latest print and at first glance it seems like one of the two things I changed may have done the trick at fixing this issue. I'll post more pictures and info later, but if it is true that making the skin thickness and extrusion width multiples of the layer height fixes my issues I'm not sure what I'll think. On one hand, I'll be extremely happy because I love the way kisslicer does pretty much everything (support, tool path, slice speed, available settings, etc)....but (there's always a but), it will be really unfortunate that I have to have uber-thick bottom and top layers to have 3 perimeters (at least 1.2mm using my 0.4mm nozzle). It would suck to have 6 solid layers on the top and bottom using a 0.2mm nozzle height.

[Davide Ardizzoia]

Having more control on top and bottom surface thickness is hopefully something that Jonathan will consider along the beta path.
Glad you had improved the quality!

Brgd
Davide Ardizzoia

[treemagnet]

don't know if this helps but I have the same problems with PLA. I lowered my bed temperature from 70 to 40 and they came out much better. I also use Kapton and nothing else