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Prusa mini+ PETG stringing  

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DenisC77
(@denisc77)
Active Member
Prusa mini+ PETG stringing

Hi All,

I'm a new purse mini+ user, and I have issues with stringing with a brand new prusament petg. I did some retraction test with prusaslicer and prusament profile.

I started with all default settings (3,2mm retraction distance), this is the result:

then I tried to increase the retraction distance (see measure in the photo):

but due to the very bad results, and the fear to increase too much, I roll-back with standard settings (3,2):

but the results are still worst than before... how can I have a print without stringing with prusament PETG? 

 

thanx in advance

Posted : 07/05/2022 8:50 am
Diem
 Diem
(@diem)
Noble Member

Your filament is damp.  Dry it and try again.

Cheerio,

Posted : 07/05/2022 11:32 am
languer
(@languer)
Trusted Member
RE: Prusa mini+ PETG stringing

@diem is probably right on. A lot of drying.

Posted : 08/05/2022 12:58 am
DenisC77
(@denisc77)
Active Member
Topic starter answered:
RE: Prusa mini+ PETG stringing

really? It wet so quickly? What do you use to dry? Is the sunlu s1 dryer box or similar sufficient?

Posted : 08/05/2022 5:58 am
MileHigh3Der
(@milehigh3der)
Estimable Member
RE:

That looks like it would work/actively-dry the filament. I use a ‘filament drier’ that is really just a food dehydrator. 

The one you linked to is pretty sweet- and would be good if you are using one filament on one printer.  If you have more printers and need to keep more filament at the ready, those at $44 each would get expensive (think of an MMU2 with 5 active filaments).

It is amazing how much better well dried filament prints.  I live in a very dry area and I still dry my PETG after a couple of days.  Nylon/PCTPE I do the day of.

 

I also dry my filament and then put it in a larger ‘zip-loc’ freezer bag with a desiccant holder that I designed and printed.  It hold indicating desiccant so you can see if the bag has picked up moisture.

 

https://www.printables.com/model/155359-filament-desiccant-holder-for-spool

This post was modified 2 months ago by MileHigh3Der
Posted : 08/05/2022 2:45 pm
sandysasmita
(@sandysasmita)
Trusted Member
RE: Prusa mini+ PETG stringing

How about decrease retraction length to 2.0mm? 

Posted : 08/05/2022 5:12 pm
DenisC77
(@denisc77)
Active Member
Topic starter answered:
RE: Prusa mini+ PETG stringing

 

Posted by: @milehigh3der

That looks like it would work/actively-dry the filament. I use a ‘filament drier’ that is really just a food dehydrator. 

The one you linked to is pretty sweet- and would be good if you are using one filament on one printer.  If you have more printers and need to keep more filament at the ready, those at $44 each would get expensive (think of an MMU2 with 5 active filaments).

It is amazing how much better well dried filament prints.  I live in a very dry area and I still dry my PETG after a couple of days.  Nylon/PCTPE I do the day of.

 

I also dry my filament and then put it in a larger ‘zip-loc’ freezer bag with a desiccant holder that I designed and printed.  It hold indicating desiccant so you can see if the bag has picked up moisture.

 

https://www.printables.com/model/155359-filament-desiccant-holder-for-spool

I too was thinking of buying a food dehydrator, but since I only have 2 printers, and I use 1 at a time as a hobby, I bought the sunlu s1 that I should receive tomorrow ... I have already seen that it will be necessary to modify it by adding a fan, but I hope it does a good job! Then once they are dried I will vacuum them (thanks for the link, that project is very interesting!)

Posted : 08/05/2022 6:03 pm
DenisC77
(@denisc77)
Active Member
Topic starter answered:
RE: Prusa mini+ PETG stringing

 

Posted by: @sandysasmita

How about decrease retraction length to 2.0mm? 

OMG 2.0mm seems a dream! Did you decrease only retraction length or you modified the temperature too?

Posted : 08/05/2022 6:05 pm
sandysasmita
(@sandysasmita)
Trusted Member
RE: Prusa mini+ PETG stringing

I only decrease the length. About temp, it depends on your filament specification, not all filament are same, i use 230c but you might have different temp with your filament. Anyway i have dried my PETG before. So you might want to buy filament dryer Like this one ... i think this is an investment for long term usage, you will need this sometimes... sunlu S1 only keep dry when you printing, but you can't use it for a dryer... my sunlu s1 only max about 50% humidity and 40'c so i using eibos cyclops to dried my filament. Eibos dryer can do up to 10% humidity and reach higher temp than sunlu s1

Posted : 09/05/2022 1:18 am
DenisC77
(@denisc77)
Active Member
Topic starter answered:
RE: Prusa mini+ PETG stringing

 

Posted by: @sandysasmita

I only decrease the length. About temp, it depends on your filament specification, not all filament are same, i use 230c but you might have different temp with your filament. Anyway i have dried my PETG before. So you might want to buy filament dryer Like this one ... i think this is an investment for long term usage, you will need this sometimes... sunlu S1 only keep dry when you printing, but you can't use it for a dryer... my sunlu s1 only max about 50% humidity and 40'c so i using eibos cyclops to dried my filament. Eibos dryer can do up to 10% humidity and reach higher temp than sunlu s1

Thanx for your suggestion... I just bought the s1 (I'll receive it today)... I'll test and try to add a fan like seen in some videos, but emboss will be the next upgrade! Thanx a lot

 

 

Posted : 09/05/2022 5:24 am
DenisC77
(@denisc77)
Active Member
Topic starter answered:
RE: Prusa mini+ PETG stringing

 

Posted by: @denisc77

 

Posted by: @sandysasmita

I only decrease the length. About temp, it depends on your filament specification, not all filament are same, i use 230c but you might have different temp with your filament. Anyway i have dried my PETG before. So you might want to buy filament dryer Like this one ... i think this is an investment for long term usage, you will need this sometimes... sunlu S1 only keep dry when you printing, but you can't use it for a dryer... my sunlu s1 only max about 50% humidity and 40'c so i using eibos cyclops to dried my filament. Eibos dryer can do up to 10% humidity and reach higher temp than sunlu s1

Thanx for your suggestion... I just bought the s1 (I'll receive it today)... I'll test and try to add a fan like seen in some videos, but emboss will be the next upgrade! Thanx a lot

 

 

Finally I change my order and switch to the eibos series x, because to mod the s1 with a fan I have to spend a little less than the price of the eibos 

Posted : 09/05/2022 7:09 pm
DenisC77
(@denisc77)
Active Member
Topic starter answered:
RE: Prusa mini+ PETG stringing

with the new dryer, i tried to dry the same petg and try to reprint... i would never have believed it, but the difference is incredible with the same settings the stringing is 0!!!

Posted : 13/05/2022 12:54 pm
sandysasmita
(@sandysasmita)
Trusted Member
RE: Prusa mini+ PETG stringing

That is PETG... they should be dried before you print... sometimes PLA do stringing too... well at least you already have a good filament dryer... one problem has been solved.

Posted : 13/05/2022 1:02 pm
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