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[Solved] Stringing! how to fix that?  

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M8Harry
(@m8harry)
Trusted Member
Stringing! how to fix that?

So after fixing numerous issues with the mini i have it printing some what good. The makers muse tolerance test printed great! all 5 parts turn freely and the center can be removed!

So I went on to try a different test for my mini but the stringing is horrific to say the least!

Retraction, how much should i dial it up by?
Are any other settings relevant to help eliminate stringing.

This file was printed with pursament pla and on 0.07 layer height from memory,  sliced through prusaslicer.

This topic was modified 2 years ago by M8Harry
Respect the fact everyone is entitled to have an opinion, you dont have to like it or hate it, just accept its theirs and not yours and you will be ok!...
Posted : 04/01/2020 4:08 pm
PeanutButte7
(@peanutbutte7)
New Member
RE: Stringing! how to fix that?

You can try to set lower temperature and slower print speed from what I searched.

Posted : 04/01/2020 6:48 pm
Minos
(@minos)
Active Member
RE: Stringing! how to fix that?

What are you using to slice the model? Prusaslicer does not have coasting and this a bowden printer, so your rely on linear advance if supported by the mini firmware.

I would download a stringing test model and try to calibrate as discussed above, adjusting the print temperature. Printing speed should not matter that much, but bridging speed( or movement speed when not printing ) does.

When troubleshooting stringing issues try to determine where the blobs  you see in the string are created. If they are created on the begging of a move you can use coasting to reduce it. if they are before the nozzle lands, at the end of a move, wipe will help. The size of the blobs can also provide guidance as to whether you are retracting too much or too little.

 

 

Posted : 07/01/2020 3:17 pm
Lichtjaeger
(@lichtjaeger)
Noble Member
RE: Stringing! how to fix that?

I assume the main issue is the little time your layers have to cool down. Like @peanutbutte7 suggested you could reduce the speed, but simply printing more objects at the same time is more effective and will do the trick as well. 😉

@minos197 confuses travel speed with bridging speed. But increasing travel speed could actually help. Also, coasting and linear advance are features to improve edges and seams. Bad settings will increase stringing, but if you don't have issues with the seams, you don't need to tweak those settings.

Lowering printing temperature will reduce stinging, but it also weakens your object. Same is true for more cooling.

If you want to tweak with your retraction settings: The retraction distance on a Bowden extruder is usually between 2 and 8mm and the retraction speed between 35 and 45mm/s. Start with low values, because too high values will introduce blockages.

Posted : 08/01/2020 3:33 pm
Crawlerin
(@crawlerin)
Prominent Member
RE: Stringing! how to fix that?

@lichtjaeger

This is useful info in one place, thanks.

Posted : 08/01/2020 5:50 pm
M8Harry
(@m8harry)
Trusted Member
Topic starter answered:
RE: Stringing! how to fix that?

Thanks for the input guys n gals, its appreciated.

After reaching out to support and waiting a bit for an email back they had me strip this pain in the arse printer down again rebuild the hot end and after 2 jams I rebuilt it differently to the instructions (changed the method supplied) and I have it printing again and after a test print of the same file in the original picture 3d fillies filament printed great very very minor stringing! Granted it was printed at 200 degress and not 215. The print still "failed" as the printer printed the parts but they were fused together and did not turn. The file is 3 "eggs" one inside the other and if printed correctly they should turn independently of each other.

Im about to try again with prusament, fingers crossed.

I will slow the print speed slightly and slightly and report back.

Again a massive thank you to all who have responded.

Respect the fact everyone is entitled to have an opinion, you dont have to like it or hate it, just accept its theirs and not yours and you will be ok!...
Posted : 11/01/2020 6:16 am
M8Harry
(@m8harry)
Trusted Member
Topic starter answered:
RE: Stringing! how to fix that?

I printed a stringing test and the stringing now is defiantly reduced. The first pin that prints has small blobs on the inside edge that I want to fix, I will have a play around with coasting and linear advance.

Respect the fact everyone is entitled to have an opinion, you dont have to like it or hate it, just accept its theirs and not yours and you will be ok!...
Posted : 11/01/2020 12:58 pm
M8Harry
(@m8harry)
Trusted Member
Topic starter answered:
RE: Stringing! how to fix that?

Do after spending 3 hrs on the chat with support. I went from this

 

To this

 

To this

 

Very happy.

 

 

Retraction now at 3.8

Idler tension increased

Retraction on layer change enabled.

 

The stringing test came out great. I'm now reprinting the resliced torture egg to see how it goes

This post was modified 2 years ago by M8Harry
Respect the fact everyone is entitled to have an opinion, you dont have to like it or hate it, just accept its theirs and not yours and you will be ok!...
Posted : 11/01/2020 7:03 pm
bobstro
(@bobstro)
Illustrious Member
RE: Stringing! how to fix that?

Care to summarize their recommendations for the benefit of others who may be looking for a solution? Glad you got it working.

My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 11/01/2020 7:07 pm
M8Harry
(@m8harry)
Trusted Member
Topic starter answered:
RE: Stringing! how to fix that?
Posted by: @bobstro

Care to summarize their recommendations for the benefit of others who may be looking for a solution? Glad you got it working.

Retraction now at 3.8 - slowly increased this over prints

Idler tension increased - 1/2 a turn per print

Retraction on layer change enabled. This gave instant results. It stopped the blobs.

 

Make small changes and test the settings. Had to revoke some changes, but ultimately it's going great now

 

Respect the fact everyone is entitled to have an opinion, you dont have to like it or hate it, just accept its theirs and not yours and you will be ok!...
Posted : 11/01/2020 7:31 pm
PaulC
(@paulc)
Active Member
RE: Stringing! how to fix that?

Can I ask what retraction speed you set??

Many Thanks.

Posted : 14/07/2020 8:14 pm
John R
(@john-r-2)
Active Member
RE: Stringing! how to fix that?

@m8harry

Sorry for the dumb question, but I am having same issue with my mini!  What does "idler tension increased - 1/2 turn per print" mean.  is that a setting or something you are doing to the printer?

Thanks!

...
Posted : 24/07/2020 7:52 pm
PaulC
(@paulc)
Active Member
RE: Stringing! how to fix that?

Hi John-r9,

Idler tension refers to the actual printer. It's the tension on the idler wheel within the extruder. If you look at the following link and scroll down to the bottom there's a picture of the idler adjustment screw location. You need just enough tension to properly grip the filament without damaging it.

https://help.prusa3d.com/en/article/clicking-extruder-under-extrusion-and-clogging-mini_112011

Good Luck,

Paul C.

Posted : 25/07/2020 8:11 am
marklinmax
(@marklinmax)
Active Member
RE: Stringing! how to fix that?

Hi,

I have been printing with my MINI for quite a few hours now, and I can't get rid off of my stringing issue. Lowering temp, increasing retraction and retract on layer change helped a bit, but didn't solved the issue.

So when I see this, I start thinking that I have some issues with my printer.
https://www.reddit.com/r/prusa3d/comments/ivj4wj/fedex_guy_to_3dbenchy_in_2_12_hours_this_thing_is/

To illustrate:
(first print ever, with the provided GCode in the USB stick and prusament PLA sample)

(another print, sliced with prusaslicer, 5mm retractation, prusament PLA)

As you can see, there is quite a bit of fine stringing that I can't manage to fix.

Anybody with the same issue?

Posted : 26/09/2020 8:44 am
buenso80
(@buenso80)
New Member
Another stringing issue on the mini

@marklinmax

I know this is an Old thread but still relevant for me anyway.

did you ever get rid of the stringing, and what parameters did you change in prusaslicer?

Posted : 12/10/2021 7:10 pm
marklinmax
(@marklinmax)
Active Member
Another stringing issue on the mini

Hi @buenso80,

I haven't yet!

I got the printer returned to the factory where they did some tests, including some prints, which I have to say came out really great.
So it led me to suspect other factors to which the printer might be particularly sensitive, like the power-supply or my own home electricity.

Anyway, I haven't had much time to conduct further investigation on that lately, so I just take more time to clean the prints afterwards.

Posted : 14/10/2021 4:16 pm
Urshurak776
(@urshurak776)
Eminent Member
Stringing....

So, I bought two rolls of Jesse filament.  Love their colors.  First roll printed really nice, but had some stringing.  I tried temperatures, retraction, etc.  Got it minimized but still had some stringing.  Not a huge deal, quick shot with heat gone and it was gone.  Prints looked fantastic.  Second roll, right out of the package was perfect.  No stringing at all.  None.  Beautiful.  My conclusion is that probably varying degrees of moisture.  I need to get a dehydrator or filament dryer and dry each roll really good before it goes on printer.  I really think a lot of the stringing issues people have is because of wet filament.

Posted : 15/10/2021 3:27 pm
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