Layer to layer alignment

[TheShaderMan 0]

Hello, I'm trying to print a tube, rather thin, but i'm running into a weird slicing effect.

It's a very simple model, just a tube, but the slicer is making weird ring effect, layers are not identical to one another.

 

The print is rather ugly. looks like a defective printer...

Any options I missed to make this random ring effect disappear ?

 

Thanks

 

[gr5 2,167]

Wow.  I suspect the model in this case.

 

[TheShaderMan 0]

Well, maybe, but It cannot be much simpler.

 

It happens as soon as the wall thickness is close to the nozzle width (in this case 0.4) somewhere between one and two nozzle width (so 0.4-0.8mm)

Basically, as the tube is a mesh, both inner and outter circles have 128 vertices.

 

The distance between them is roughtly 0.45mm to ensure that 0.4mm is always there.

 

It's a simple extrusion. Please find an exemple attached.

test.stl

[peggyb 169]

the test is very tiny, and the wall thickness is small. The nozzle should be able to to run 2 times along the surface, inside and outside of the cilinder. And then it gets crowded with only 0.45 mm.

It is easier to take a solid cilinder and print with one wall (or two), no infill, top and bottom, or even better in vase-mode.

[peggyb 169]

to get your test model right: 

play with the line width, example: set it smaller, to 0.33 and see what happens

disable 'compensate wall overlaps'

set 'z seam alignment' to shortest

[gr5 2,167]

1) Try the option in cura "print thin walls".

 

2) Try this version of cura - it is MUCH BETTER at printing thin walls.  It was created by someone active on this forum, @burtoogle who doesn't work for Ultimaker but has made many contributions to Cura:

 

https://www.dropbox.com/sh/s43vqzmi4d2bqe2/AAADdYdSu9iwcKa0Knqgurm4a?dl=0&lst=

[Framar 38]

Vase mode ?

 

[TheShaderMan 0]

Thanks to you all for the suggestions

 

"Print thin walls" does not help.

"Spiralize outer walls" does help (but not in the case in picture)

the modded version does pretty much the same as the vanilla one.

 

Regarding "It is easier to take a solid cilinder and print with one wall (or two), no infill, top and bottom, or even better in vase-mode."

Yes, for this particular example, but a need print like these

It won't work.

 

My only option is to widen the thin walls

 

M.

 

[gr5 2,167]

Definitely go with my #2 suggestion above then.  

 

 

[gr5 2,167]

Wait - those things are tiny?  smaller than 1cm across?  You should use a smaller nozzle.  I'd use a 0.25mm nozzle for those.  You can set line width at 0.2mm and use a .25mm nozzle and get great results.  Make sure to print at least 5 at a time so that each one can cool while it's printing the others.