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Cobwebs on my print!!  

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Alphonse
(@alphonse-2)
Active Member
Cobwebs on my print!!

I printed a model of a turbocharger fan.  The finished print is covered in cobwebs!  I think the underlying print is likely good but wanted to explore this a bit before I take a nylon brush to it.  

The printer filament is Prusament Galaxy Black PLA.  Prusa Slicer defaults were used for the PLA.  The print settings were at 0,05 ULTRADETAIL.  It was a 5 + hour print.  The scale is 50 mm in diameter and ~25+ mm high.   The first layer calibration and print was excellent.

What causes these cobwebs?  I am wondering if it is temperature related.  It appears that the small threads are being spun/pulled as the nozzle flow stops and the nozzle moves to another structure in the print. For example, moving from feature to feature is it pulling a tiny thread that forms the cobwebs.

This topic was modified 3 months ago 2 times by Alphonse
Posted : 22/07/2021 4:13 am
BogdanH
(@bogdanh)
Reputable Member
High precission printing

My thoughts about this (without seeing resulting print)..

Me personally, I would never use 0,05 detail. Not because it's impossible to print at that setting. It's just, for that to work good, complete system (hotend & extruder) must be in perfect condition. Not to mention, that printing settings (temperature, etc.) must be carefully tuned for particular filament. For example, if amount of extrusion isn't that perfect or evenly, that won't even be noticed at 0,2 quality setting. At 0.05 however, even the smallest deviation can have big impact on result. In short: it's extremely hard to control filament flow with such precision when so many parameters are involved.

Speaking for me, I never go below 0,1mm. First is, to avoid the hassle and second, I don't need higher (than 0,1mm) details in print. Saying that, if you mostly print stuff that requires such precision, maybe you should think about a resin printer.

Just sharing my thoughts

Mini+ with Bondtech upgrade & modified firmware...
Posted : 22/07/2021 8:40 am
Alphonse liked
Neophyl
(@neophyl)
Famed Member

Fine stringing (sometimes referred to as angel hair) is often a indicator of filament that needs drying.  It can also be from a slightly too hot printing profile but its also more prevalent with bowden style extruders such as the mini uses.  The ultradetail print setting probably wont have helped any.  I agree with Bogdan.

However its VERY easy to remove.  Just use a jet flame lighter (the blue flame type).  An extremely quick pass makes the fine hairs shrivel up without damaging the model.

Posted : 22/07/2021 11:39 am
Alphonse liked
Diem
 Diem
(@diem)
Noble Member

Please post a picture of the problem.

Cheerio,

Posted : 22/07/2021 11:49 am
Alphonse
(@alphonse-2)
Active Member
Topic starter answered:
Photos - again!

 

Posted by: @diem

Please post a picture of the problem.

Cheerio,

Maybe since my post had to be approved by a moderator, it dropped the photos?  Regardless, here they are again:

The model from Slicer:

The print on the printer bed:

Off the printer and ready for cleaning/further processing:

 

Posted : 22/07/2021 11:57 am
Alphonse
(@alphonse-2)
Active Member
Topic starter answered:
I will change the quality setting

 

Posted by: @bogdanh

My thoughts about this (without seeing resulting print)..

Me personally, I would never use 0,05 detail. Not because it's impossible to print at that setting. It's just, for that to work good, complete system (hotend & extruder) must be in perfect condition. Not to mention, that printing settings (temperature, etc.) must be carefully tuned for particular filament. For example, if amount of extrusion isn't that perfect or evenly, that won't even be noticed at 0,2 quality setting. At 0.05 however, even the smallest deviation can have big impact on result. In short: it's extremely hard to control filament flow with such precision when so many parameters are involved.

Speaking for me, I never go below 0,1mm. First is, to avoid the hassle and second, I don't need higher (than 0,1mm) details in print. Saying that, if you mostly print stuff that requires such precision, maybe you should think about a resin printer.

Just sharing my thoughts

Thanks for the insights and advice. I appreciate your response.  Please see the photos I just added above.  (Awaiting moderation since I am new to the forum.)

The printer is new and everything is in "out of the box" condition. I have had some remarkable test prints thus far and I am delighted.

This print was simply another test print and some "learning by doing".    I will change the print settings to 0.15 and give it a spin again. 

Posted : 22/07/2021 12:12 pm
DRKMSTR
(@drkmstr)
Trusted Member
Post Process

Have you tried hitting it with a heat / hot air gun? That usually cleans up fine strings for me.

Stringing and "cobwebs" are usually an unfortunate result of bowden-style systems. I either increase my layer height or use "travel within part" / "avoid crossing perimeters" settings in the slicing software.

Posted : 22/07/2021 2:10 pm
Alphonse liked
Diem
 Diem
(@diem)
Noble Member

Dry your filament and try again.  This sort of part is usually stronger at Ca. 0.2mm layer thickness.

Cheerio,

Posted : 23/07/2021 5:31 pm
bobstro liked
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