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My Mk3s+ just started stringing and won’t stop  

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austinsmithyrex
(@austinsmithyrex)
Active Member
My Mk3s+ just started stringing and won’t stop

Hi everybody, please forgive me if this is the wrong place to post this.  I have a Mk3s+ that I’ve had for a few months and all of a sudden it’s stringing.  I have dried filament, and replaced entire hot.  The part I’m having trouble with is it worked perfectly before, printer is in an enclosure where it’s at about 24c while printing with the doors open.  While changing hot end I cleaned gears, tightened grub screws on extruder gear and still the same result.  Temp tower showed best print at around 180-190 with PLA, why would it change?  Has always worked great with Prusaslicer settings!  I use filament pm and Prusa filament most of the time.  Any ideas would be great!  Again, what I don’t understand is why it would work fine then not…

 

thank you!!!!

Posted : 12/06/2023 6:48 pm
Diem
 Diem
(@diem)
Famed Member

What sort of stringing?  Pictures would help...

Have you been printing abrasive filaments?

Cheerio,

Posted : 13/06/2023 9:10 am
austinsmithyrex
(@austinsmithyrex)
Active Member
Topic starter answered:
RE:

thanks for the response, I did 3 stringing tests left to right is .8mm,1mm,2mm retraction  

This post was modified 6 months ago by austinsmithyrex
Posted : 13/06/2023 2:23 pm
austinsmithyrex
(@austinsmithyrex)
Active Member
Topic starter answered:
RE: My Mk3s+ just started stringing and won’t stop

No abrasive filaments and stock new hotend from Prusa with new nozzle

Posted : 13/06/2023 2:59 pm
Diem
 Diem
(@diem)
Famed Member

That looks like extremely wet filament and yet you dried it ... we do see a lot of humidity problems at this time of year ... how are you drying it?

Cheerio,

Posted : 13/06/2023 4:44 pm
austinsmithyrex
(@austinsmithyrex)
Active Member
Topic starter answered:
RE: My Mk3s+ just started stringing and won’t stop

Thanks, It happens with all filament, I have a sunlu filament dryer, that vents humidity (printed part) and the filament is maybe a couple weeks old

Posted : 13/06/2023 5:28 pm
Diem
 Diem
(@diem)
Famed Member

OK.  Try a loooong drying session, if that doesn't work save a .3mf of your test print ( Files > Save Project as )

Zip the .3mf and post it here. It will contain both your part and your settings for us to diagnose.

Cheerio,

Posted : 13/06/2023 5:38 pm
austinsmithyrex
(@austinsmithyrex)
Active Member
Topic starter answered:
RE: My Mk3s+ just started stringing and won’t stop

Awesome thank you!!!! I really appreciate it!

Posted : 13/06/2023 5:39 pm
austinsmithyrex
(@austinsmithyrex)
Active Member
Topic starter answered:
RE: My Mk3s+ just started stringing and won’t stop

Stringing test.3mf

here is the mf file, stringing got a tiny bit better but still horrible.  I dried for 24 hrs at 50C. Filament lost 4 grams.  Any ideas? and thank you!!

Posted : 15/06/2023 2:18 am
Diem
 Diem
(@diem)
Famed Member

So you got a small improvement and a measurable weight change...

It's a while since I printed at 0.1mm so I used your settings with a known damp filament - it's been left out for a week - and got results similar to your last example.  I retried with recently dried filament and got a much better result.

I wonder if your dryer is working as it should..?  Try oven drying as a comparison, you need an accurate electric oven; there are plenty of threads here.

Cheerio,

Posted : 15/06/2023 12:09 pm
Thejiral liked
austinsmithyrex
(@austinsmithyrex)
Active Member
Topic starter answered:
RE: My Mk3s+ just started stringing and won’t stop

thanks, I’ll try again! 

Posted : 15/06/2023 2:10 pm
austinsmithyrex
(@austinsmithyrex)
Active Member
Topic starter answered:
RE: My Mk3s+ just started stringing and won’t stop

I dried again for 24 more hours and still a bit of stringing, I opened a brand new roll of filament pm filament and it was stringy too.  Any other ideas?  Thank you!!

Posted : 20/06/2023 3:46 pm
Diem
 Diem
(@diem)
Famed Member

The other likely culprits are overtemperature - but your settings worked OK here; and a damaged nozzle but yours is new ...

You *might* have thermistor going out of spec in an unusual manner - or you *might* have installed a badly manufactured nozzle.

Otherwise I'm stumped.

Cheerio,

Posted : 20/06/2023 5:31 pm
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