Recently my prints come out very messy. I tightened everything up and checked the extrusion multiplier.

I have an Ender 3 Pro which I use together with Cura 4.2.1 (and Octoprint). I print in PLA at 190°C. The print bed is set to 70°C. The Bed temperature is lower though, since I use a glas bed on top of the heated bed. I use a print cooling fan at 100%. The layer height is set to 0.2 mm, the line width 0.4mm from the 0.4mm nozzle. My retraction is 5mm at 45mm/s.

Does anyone have any idea what the reason could be?

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    $\begingroup$ Hello Chry007. Your question is very terse and 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 < afterward. This will turn it visible and help us help you find the actual problem. $\endgroup$ – Trish Sep 12 '19 at 7:09
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    $\begingroup$ Hi Trish, thanks for your help! :) I edited in as much info as I could. $\endgroup$ – Chry007 Sep 12 '19 at 14:15
  • $\begingroup$ Are the walls very sparse/porous/brittle? It looks to me like you might have severe underextrusion from filament diameter being set to 2.85 or 3 rather than 1.75 (a common problem with Cura). $\endgroup$ – R.. GitHub STOP HELPING ICE Sep 12 '19 at 16:27
  • $\begingroup$ Hi R., not at all. I can' break the model with my hands. I just doublechecked the settings in Cura and it's set to 1.75mm $\endgroup$ – Chry007 Sep 12 '19 at 17:03
  • $\begingroup$ @Chry007 speed retraction is too low, the amount of retraction is too high... $\endgroup$ – Fernando Baltazar Sep 12 '19 at 17:51

I figured out the problem. I reduced printing speed and printing temperature and the print came out decent. Still some issues but worlds better then before. I will try a few more settings to determine exactly what was the actual Issue. I will also try what @Fernando Baltazar recommended and update here what exactly changed the printing quality.

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  • $\begingroup$ "Retraction amount is too high" is not a thing unless you have increased it to some extreme amount or have a specialized hotend. Lower than 5 mm is definitely bad. $\endgroup$ – R.. GitHub STOP HELPING ICE Sep 15 '19 at 13:44
  • $\begingroup$ I can confirm. I tried with 3.5mm and the only result was more stringing. $\endgroup$ – Chry007 Sep 15 '19 at 15:55
  • $\begingroup$ what speed and temp did you end up going with? $\endgroup$ – mrdeml Mar 1 at 2:11

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