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How much stringing is too much?  

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DrBomb
(@drbomb)
New Member
How much stringing is too much?

I've had a the Prusa Mini for almost a year now. I would say my experience has been very postive, sans one thing... Stringing and Oozing.

I've tried multiple things

  • Retraction changes
  • Temperature changes and temp towers. Stringing starts to dissapear around 175C, which I think could compromise the prints
  • With Prusa support's suggestion, after getting the tools, I dissasembled and reassembled the heater block and reapplied thermal grease.

The only thing I'm missing is changing the nozzle, but I live on South America and shipping to here takes a long time. Or doing extruder multiplier callibrations which also need some specific and hard to get instruments here.

Here's the current print progress:

Print with a lot of stringing

My question to the community is:

Is this too much stringing? What are your experiences with stringing on the prusa mini? I just don't know if I'm overreacting or if I'm correct to think this is not a good stringing amount. What would you suggest me to do to get this addressed?

Thanks for reading!

Posted : 24/11/2021 4:27 pm
sandysasmita
(@sandysasmita)
Eminent Member
RE: How much stringing is too much?

Did you dried your filament? You can try to change the retraction length to 2mm. And most of filament should works well at 210-215 C. I think 175C is too low.

Posted : 24/11/2021 4:45 pm
DrBomb
(@drbomb)
New Member
Topic starter answered:
RE: How much stringing is too much?

Yeah, I dried my filament with those drier boxes they sell in aliexpress.

Does not seem like it improved on any way. I did try adding more and more retraction on previous attempts at reducing stringing. The current print is set to a retraction of 3.2 by the Prusa Mini presets on Prusa Slicer with the stringing seen on the picture.

Posted : 24/11/2021 5:02 pm
sandysasmita
(@sandysasmita)
Eminent Member
RE: How much stringing is too much?

For my mini, 3.2mm only works for prusament. But for the other brand, i need to change the retraction length to 2.0mm to get a better results.

Posted : 24/11/2021 5:09 pm
BogdanH
(@bogdanh)
Honorable Member
RE: How much stringing is too much?

 

Posted by: @drbomb

Yeah, I dried my filament with those drier boxes they sell in aliexpress.

Does not seem like it improved on any way...

Because most of them are not capable to actually dry the filament -they are meant to keep already dry filament dry, while printing. The best filament drier is the cheapest: food dehydrator.

[Mini+] [MK3S+BEAR]...
Posted : 24/11/2021 7:52 pm
fuchsr
(@fuchsr)
Noble Member
RE: How much stringing is too much?

Some filament will also string more than others. I'm currently fighting some Sunlu PETG, and it has resisted all my efforts to reduce stringing with ease.

A heat gun is a valuable addition to your tool kit. A few blasts of the heat gun can save you hours of optimization. Maybe intellectually less satisfying but pragmatic.

Posted : 25/11/2021 2:41 pm
MysDawg liked
Chevair
(@chevair)
Active Member
RE: How much stringing is too much?

This issue is bigger than changing a nozzle or retraction. Some filaments are just stringier than others. I'm using a certain brand right now, a local one that makes my Prusa mini look like a cheap Chinese printer. It's oozing, stringing, clogging...slipping, making my extruder work harder. I thought, initially that I'm dealing with mechanical problems until i switched to a different brand. 

I don't know what filament you are using but try to buy one really good roll and print again with default settings and compare.

Posted : 02/12/2021 4:23 pm
d0ug
 d0ug
(@d0ug)
Trusted Member
RE: How much stringing is too much?

That's about average I see on mine depending on what i'm printing. I've just learned to live with it. I just take a lighter to the parts when done, makes the strings ball up against the piece, then just rub them off or scrape them off with a fingernail.

Posted : 04/12/2021 12:31 am
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