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When I'm printing sometimes there is some "transparency" between the layers as you can see in the picture, I'm not sure how to name the problem.

enter image description here

I've looked on google, somes people said It could be the nozzle that is clogged, I cleaned it and it doesn't seem clogged.

I've also seen that it could be the pressure of the spring in the extruder arm, I adjusted it.

I also checked the bed level and it looks fine.

With all thoses changes et verifications I still have the problem, not even a small improve.

Some time ago I didn't have any problem, I didn't change the cura parameters, and the problem is for every 3D files, not only this one.

In your experience what could cause this ? Did I do something wrong ?

I have a artillery sidewinder x1 which I use together with Cura. I print in PLA at 200 °C. The print bed is set to 50 °C . I use a print cooling fan at 100 %. The layer height I set to 0.16 mm, the line width 0.44 from the 0.4 mm nozzle. The Printing Speed is set to 30 mm/s for walls and 60 mm/s for infill. My retraction is 5 mm at 45 mm/s.

EDIT 30/08/2022:

I have tried to print the gcode given by artillery (which is the manufacturer of the 3d printer), there is two files a cube and a chick, I have the same problem except that it's only the infill.

enter image description here

This file is supposed to be perfect for the printer so to my understanding the problem is not from the software setting in cura, but from the printer itself.

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    $\begingroup$ Hello Gregory, welcome to 3DPrinting.SE! Your question is lacking detail and as such is hard to answer without knowing a couple of things about your printer setup. Please edit and fill in the [placeholders] in the template I added and then remove the leading <!-- and trailing --> afterwards. This will turn it visible and help us help you find the actual problem. $\endgroup$
    – 0scar
    Aug 29, 2022 at 18:03
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    $\begingroup$ I've just added all the details you asked for, it's almost all the settings from the profiles I downloaded from the manufacturer, I think I only changed the bed temperature. $\endgroup$ Aug 29, 2022 at 18:38
  • $\begingroup$ Your problem is underextrusion, no doubt. The question is what is causing this. As a few hints, please inspect he extruder (the spring or filament tensioning mechanism) and the slicer (1.75 mm diameter and flow modifier), Also be sure it isn't in volumetric extrusion. $\endgroup$
    – 0scar
    Aug 30, 2022 at 21:33
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    $\begingroup$ I've disassembled the extruder parts and clean everything, there was some dust, but not a big amount. I've reassembled every thing. I've adjusted the tension of the spring, the feeling was different than before when doing it, I think last time I disassembled things, I must have badly re-assembled it. The manufacturer print looks fine now. I'm trying my files now. I'll post a new comment when I have printed more files. $\endgroup$ Sep 1, 2022 at 16:55

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I found out what was the problem here, like @0scar said I think it was the tension spring that was wrongly set, even if I had checked it before.

Also the real name of the problem was "underextrusion" and not "transparency between the layers"

Here is the steps I followed to fix it:

I disassembled the extruder by removing the screw on the side like on the picture, there is also two behind the FAN.

enter image description here

After that I had access to every gear that was pulling the fillament.

I cleaned everything, there was some dust but not a big quantity so I don't think I was the problem.

I also removed the spring and the spring handle. I change the tension of the spring to be as low as possible. Then I reassembled every parts.

After that I have redone the bed level and the spring tension.

Compared to the first time that I change the spring tension, this time the gear to change it felt easier, there was less resistance than last time. Even so I changed the tension to the lowest possible each time.

After doing all that I printed the manufacturer print file, It was ok, there was no longer under extrusion. Then I tried multiple file of mine, which didn't print well before all that, this time it was perfect.

I think the real problem here was that some time ago I have disassembled the extruder and when I reassembled it I must have badly re-assembled it. Especially the spring part, since the feeling was different.

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