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Stringing and PrusaSlicer settings  

Muldee Things
Active Member
Stringing and PrusaSlicer settings

Hi everyone,

since the very first print with my Mini, I get a lot of stringing. Using the samples of Prusament PLA that comes with the printer the fenomenon is definitely present, but switching to Sunlu PETG the thing got worst. This was expected (I suppose) as PETG prints at higher temperatures.

Nevertheless I'm trying to solve the problem, but suddenly I'm stuck with doubt. Reading from the "Stringing and oozing" page on Prusa Knowledge Base, I read:

"Use the correct value for retraction. Users often increase retraction to meaningless values, so check the PrusaSlicer settings and make sure that you have the retraction set to a maximum of 2 mm. Retraction settings can be found in PrusaSlicer in Printer Settings – Extruder 1."

The problem is, in PrusaSlicer the default setting for retraction is already 3.2 mm, way over the suggested maximum. What I'm supposed to do? Keep increasing the value until I solve the stringing? Take it back to a "correct" 2 mm?

Thank you

Posted : 17/04/2020 8:52 am
Illustrious Member
RE: Stringing and PrusaSlicer settings

The Mini uses a bowden setup instead of direct drive as on the Mk3. That documentation was probably written for the Mk3 printer. I'm not sure how much retraction you can do on the Mini. Remember that retraction, wiping, coasting (Cura) and other measures are work-arounds for stringing. The cause of stringing is often simply over-extrusion. Fix the over-extrusion and you'll fix your stringing. The easiest way to do that is to calibrate your extrusion multiplier for each filament to account for differences between your slicer settings and real-world printer and filament specs.

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He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 17/04/2020 5:29 pm
New Member

Does anybody have a good set of average settings I can start with on strining? I have a mini+ and the Prusa docs are very vague.

Thank you

Posted : 12/08/2021 9:11 pm
J.P. Ryll
Active Member
My Way to Stringingheaven

Hey Mates,


I had the same problem in every print with my Mini (without +)
I tried to print the retraction-calibration from this page:
With every retractionsetting there was no strinig. So I knew, the problem must be at the slicer settings. (try it by your own. I recommend the feedspeed at 40mm/s)

Now I print with an retraction of 3.2mm or at prints with long gaps with an retraction of 4.5mm.
Retraction (and deretraction) speed is set to 40.
But I think the most important setting was to set the "retract amaount before wipe" to 0%.

May try to copy some of the speed settings from the page to your slicer!


Hopefully you could print without stringing now!

Posted : 13/08/2021 4:52 am
New Member
Finally “no strings attached” thanks to J.P.


thank you so much for sharing your experience.

I’ve spent several days pulling my hair, and searching the web for sulutions on heavy stringing on the Prusa Mini.

None of the other solutions floating around on reddit etc. did no do any change.

Retraction length, even when raised to 6.0mm didn’t show any less stringing, but as soon as I bumped down the retraction speed , I could not believe my eyes😉


Posted : 14/10/2021 4:26 am