100% Infill with Concentric

[Quantun97]

Cura Version

5.9.0

Operating System

Windows 11

Printer

Ender 3

Reproduction steps

I got a benchy stl file and did 100% Concentric. After slicing under "Preview" it shows the benchy with lines instead of Concentric lines.

Now the settings still show concentric but the preview says otherwise after slicing because the benchy shows lines as the infill.

Actual results

It did 100% infill with lines instead of Concentric

Expected results

100% infill with Concentric

Add your .zip and screenshots here ⬇️

[GregValiant]

Thanks for the report.
I can't duplicate this. Please post a project file.
This is in 5.9.0.

[Quantun97]

How will I go about posting a project file here? STL nor OBJ file types don't work.

[Asterchades]

This isn't a bug - just a peculiar default.

By absolute default (so no intervention at all by definition or user), when you set the Infill Density to 100% the Bottom Layers count is set to 999,999. This ultimately yields the same result in that the final print is solid, but it does so by making entirely out of skin rather than infill. This is why your preview is showing the yellow Top / Bottom colouration rather than the expected orange infill colour of Greg's, as Greg has overridden this default behaviour.

See pull #19968 for more detail and a global fix.

[Quantun97]

Thank you for the thorough explanation. I appreciate the help

[Asterchades]

I should have also mentioned that you can easily override this on your own. You can manually re-set the Top Layers and Bottom Layers values, use a very-slightly-under 100% Infill Density - like 99.999% - as the behaviour will only trigger at exactly 100%, or set the Infill Line Distance to match your Infill Line Width as this gives 100% density without saying exactly that.

[Quantun97]

Good to know. I will be giving it a try.

[Quantun97]

What an interesting default. I am now however able to print at 100% infill by changing those settings. Thank you