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ferazr
(@ferazr)
New Member
Please help

IMG_5322

So my prints on a brand new mk3s+ used to be great.  Then I had a blob of death. I had to replace the hotend assembly.

 

After getting the printer set up with the new hot end, I calibrated the first layer and it look pretty good for 0.2 mm high rectangles. I am printing in PETG because I am trying to print a lack table enclosure.

 

My printer is having stringing and I think that is throwing off the first layer, but the first layer also doesn’t look as great as my rectangle test did.

 

Can anyone help?  I should stop this print right?

Posted : 05/09/2021 7:35 pm
bobstro
(@bobstro)
Illustrious Member
PETG sucks up moisture

PETG is very hygroscopic, which means it can easily absorb moisture from the air. This causes a number of print problems, including increased stringing. Before making a bunch of slicer and hardware changes to a setup that was working before, I'd try either another spool (even PLA) or drying your PETG spool. If another spool prints cleanly or drying helps, you know moisture is the cause.

If you still have problems after drying or replacing the spool, there are a number of things you can try to reduce stringing, but it really should only be minor cosmetic stringing at that point.

Post some pics so we can see how bad your problem is.

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 : 05/09/2021 7:54 pm
ferazr
(@ferazr)
New Member
Topic starter answered:
Update

I have let the print continue… stringing more… seems like the part isn’t affected too much….. what is best way to dry the spool?

Posted : 05/09/2021 8:27 pm
cwbullet
(@cwbullet)
Illustrious Member
Food dehydrator

The most cost effective means is to use a food dehydrator.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 05/09/2021 9:10 pm
Dan Rogers
(@dan-rogers)
Noble Member
Doesn't look bad at all for PETG

Too bad about your blob of doom - it must have been a doozy.  I've never had one that required replacing the hot end - share pictures it will be fun to see a really bad one.  I've had them the size of a baseball engulfing the heater block, fan shroud and lower fins on the hot end assembly - and they came off pretty easily (only have to be careful near the thermistor wires) 

Posted : 06/09/2021 1:26 pm
jsw
 jsw
(@jsw)
Noble Member

Surf here for some examples: https://www.flickr.com/groups/[email protected]/pool/

Posted : 06/09/2021 3:48 pm
ferazr
(@ferazr)
New Member
Topic starter answered:
Update. Filament? Speed increase?

Had a couple failures because the filament tangled in the spool.  Not sure why it wasn’t wrapped better since I got Prusament.  

Now it is looking pretty good… lowered the temp a little bit and stringing got better but still there.  

Couple questions that I am sure have been discussed 100s of times…

 

1) 6 hours left of a 15 hour print… How safe is it to increase speed?  To what percentage ?

2) probably will need new filament soon… prusament is pricy and I’m annoyed at the tangles in the wrapping.  What is a good brand to get?  Preferably available to buy via Amazon prime … hopefully the orange in the new brand matches up well…

May need a new spool soon

Posted : 06/09/2021 4:41 pm
Dan Rogers
(@dan-rogers)
Noble Member
My next spool of orange PETG will be ...

I have a strong tie to the UV characteristics of Prusa Orange, if you don't need Day Glow, there are many options on amazon.  A new one I will be trying next is Jayo/Sunlu orange.  Also, Geetech has a Prusament orange clone in PLA, and have promised one in PETG soon.

Posted : 06/09/2021 5:39 pm
cwbullet
(@cwbullet)
Illustrious Member
California Filaments

I can also recommend California Filaments if you are in the US.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 06/09/2021 10:23 pm
towlerg
(@towlerg)
Noble Member
Tangles

I almost always buy Prusa filaments, they're good quality and they don't gouge you on the shipping (don't know about shipping to US). Very worrying to hear about your tangles, haven't had one myself but I don't print that much. Was it Prusament (manufactured by Prusa) or just Prusa badged third party?

Posted : 07/09/2021 9:51 am
Dan Rogers
(@dan-rogers)
Noble Member
Tangles 99% end user caused

If you think about winding a spool, from start to finish, it's almost impossible to wind in a tangle (a filament loop that results in a knot).  IMO, tangles are caused by losing control of the loose end - it snaps back onto the roll and you pick it up after it has already crossed underneath of another loop. Not saying you didn't experience a tangle.  Just dubious about how it got tangled. 😉

Posted : 07/09/2021 12:28 pm
cwbullet
(@cwbullet)
Illustrious Member
tangles

Prusa makes their own filament.  I agree with Dan, I have never seen a tangle of Prusament that was not caused by me.  I suspect they are very rare on Prusament.

Posted by: @towlerg

I almost always buy Prusa filaments, they're good quality and they don't gouge you on the shipping (don't know about shipping to US). Very worrying to hear about your tangles, haven't had one myself but I don't print that much. Was it Prusament (manufactured by Prusa) or just Prusa badged third party?

 

--------------------
Chuck H
3D Printer Review Blog...
Posted : 07/09/2021 12:43 pm
ferazr
(@ferazr)
New Member
Topic starter answered:
Prusamemt

It was prusa made orange petg prusament…

it was weird because it was a brand new roll and printed for 4 hours before there was a problem… I had to untangle it with some difficulty and it looked like it was looped behind other strands like 3-4 times… after that it has gone on for many hours without an issue…

Posted : 07/09/2021 2:53 pm
bobstro
(@bobstro)
Illustrious Member
Actual twists from the factory are very (very very) unlikely
Posted by: @ferazr

it was weird because it was a brand new roll and printed for 4 hours before there was a problem… I had to untangle it with some difficulty and it looked like it was looped behind other strands like 3-4 times… after that it has gone on for many hours without an issue…

Please understand that the odds of a mid-spool tangle are extremely unlikely if not impossible to occur given the manufacturing process. It is possible for the end of a spool to become tangled if mishandled. Some crappy brands are very loosely spooled and this can create binding, but this will be apparent the moment you view the spool. However, this is a very rare experience with quality filament brands like Prusament. It might happen to you once, but if it happens regularly, your spool handling procedure is suspect.

Be aware that letting go of the end of the filament for only a moment can cause it to spring back and, if not tightened back up very carefully, create twists and binds. This is really the only way an actual twist -- where the end tucks under a preview coil --can occur. Also be sure not to let the spool spin too freely during printing. If coils come loose and are re-tightened, this can also create mid-spool binding.

This can be a bit overwhelming starting out. I can say that all of my presumed "crappy filament spooling" problems cleared up once I learned to keep control of the end of the filament and ensure it is properly clipped before storing.

 

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 : 07/09/2021 3:50 pm
jsw
 jsw
(@jsw)
Noble Member
Posted by: @dan-rogers

If you think about winding a spool, from start to finish, it's almost impossible to wind in a tangle (a filament loop that results in a knot).  IMO, tangles are caused by losing control of the loose end - it snaps back onto the roll and you pick it up after it has already crossed underneath of another loop. Not saying you didn't experience a tangle.  Just dubious about how it got tangled. 😉

Yes, it's very easy to blame a tangle on the supplier, but if you think of how the spools are wound and packaged, they are wound continuously from a larger supply of filament and as long as someone did not go out of their way to induce a tangle, the new spool of filament will be tangle-free when you get it.

It will be one continuous feed from the center of the destination spool until the machine has measured the quantity to be on the spool.

Posted : 07/09/2021 7:11 pm
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