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Does anybody have an idea what causes the strange outer wall skin texture? I don't know why this happens; the inner wall looks fine, but the outer wall looks distorted.

Also it's strange that the distortion only happens on the left side for about 2 cm on all prints.

Disabling retraction had no effect. Reducing the printing speed neither improved it.

Edit: I'm printing at 0.16mm layer height with 98% initial flow rate and 94%. No support. Standard PLA with the standard nozzle at 190°C. I am using Cura for slicing if it matters.
Printing speed is at 40mm/s for the outer wall and 80mm/s for the inner one. I already tried to decrease the outer wall speed to 20mm/s without any luck. Except for one other print, I never had an issue with those settings.
I just finished a print with 100% flow rate to exclude its the flow rate. With 100% only the front improved at all. Front side Back side

Julian
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1 Answers1

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My best guess is you have an under extrusion issue, possibly related to retraction: the issue is exacerbated on parts where the printer has to hop over a gap.

I would try running, in the order:

  1. print a flow rate test, to ensure the amount of filament exiting the nozzle matches with your configuration
  2. print a retraction test, to ensure you are not suffering from some bowden tube issues like bad coupling
  3. check for any clog in the hot end, those can require a bigger pressure to build up before the filament start flowing again
  4. print a temperature tower, to find out if 190° is the right temperature (seems a bit low to me)

With regards to point 2, the Ender 3 is somewhat renown for having poor quality couplers: watch the bowden tube couplers when printing and try to verify the tube is not moving back and forth when hopping over empty spaces...

Roberto Lo Giacco
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