Prusament PETG filament adhering to itself on spool  

OK, I presume you can rule out local effects?  A certain young lady once spilled some sort of drink on a spool of filament waiting for a colour change and it definitely affected the surface.  I can think of other drinks that might get very sticky ...

But it sounds like your spool has got hot at some point - you haven't accidentally dried it at the wrong temperature?

Simplest, though a chore, will probably be to wind it off onto another spool and then either use it from that spool or rewind it to the first one if you want to preserve the label's integrity.

Cheerio,

RE: Prusament PETG filament adhering to itself on spool

Thanks for the comments. I'm certain it wasn't anything anybody else did. My own secure office, locked, security camera, etc. I've only tried drying it once which is recently when I discovered this problem. I have a camera on the filament dryer (EIBOS Cyclops) showing it at 60C (at least according to the display on the dryer). I've had suspicions that the dryer runs hotter than the set temperature but never put the effort into measuring it. I will now. Thanks for the suggestion of unwinding / rewinding it to fix it. Wasn't sure if this was an issue with deterioration of the filament and if it was going to go to waste.

RE: Prusament PETG filament adhering to itself on spool

Hmmmm ... I've seen that with a spool of RepRapper PLA, but never with PETg.

If this were mine and I wanted to salvage it, I would be tempted to warm it (well below the glass transition temperature) in the air fryer, maybe 120F/49C or so, and manually transfer it to another spool.

RE: Prusament PETG filament adhering to itself on spool

Thank you. That's what I'm going to try.

RE: Prusament PETG filament adhering to itself on spool

Perhaps check that your dryer is not overheating?

RE: Prusament PETG filament adhering to itself on spool

Yeah that's been added to my to do list. I've suspected that it's hotter than the set temperature, especially near the hot air outlet.

RE: Prusament PETG filament adhering to itself on spool

This happened to me as well about a year ago from two spools of PETG: Prusament jet black PETG and some off brand white PETG i got from prusa's website. I asked support about it and i was told that they had never seen something like that happen before and they would talk to their filament team about it. Since its not just me who it happened to but also you I assume it has something to do with their formula because i didnt heat it too much i didnt spill anything on it or leave it in a humid place and after a couple months of not using it the spool became as if someone poured super glue all over it and the filament was brittle and stuck to itself on the spool. The picture i attached was an image of two piece of the filament, the are stuck together like glue.

RE:

My spool of PETG Jet Black is doing pretty much the same thing as kailin133's spool.  Mine was never baked and was almost new. It was opened back in June and only about 5 meters were used. It has been stored in a drybox with indicators that showed it was still very dry.

Used it for a large print last night and the next 4 or so layers of the spool worked correctly, so a good amount got printed. I got a notification from octoprint that said out of filament and it had snapped off the spool.

One one side of the spool, the closest 3 wraps are practically fused together. I can break it at the 4th wrap and unroll all the way to the opposite side and then back until about 3 layers away where it fuses again and snaps.

My only guess it it got damaged in summer heat when I was moving. But why did the first 4 roll layers work fine, and only one side fused? So strange.

Did one side of the spool get very hot?

You can also get strange gripping effects if a spool has got a little damp and dried repeatedly, some filaments will just snap unpredictably if kept badly for long enough.

I would attempt respooling and if successful dry and print the filament asap.

Cheerio,

RE: Prusament PETG filament adhering to itself on spool

I am having the same problem with a spool Signal White PETG. It's brand new. I just received it from Prusa, just opened it and it will not unspool. it is stuck to itself and is very brittle if you try to pull it apart it breaks off in small pieces. 

If it is brand new, contact Prusa Support.  My guess is that with the record heat-wave temperatures around the world it has been overheated in transit - but that *is* just a guess.

For support: Log into your Eshop account, navigate to Company, click Contact Us and 24/7 live Chat is one of the options.

Cheerio,

RE: Prusament PETG filament adhering to itself on spool

This is happening to my Prusament Jet Black PETG. Ordered it last month, have printed a few things with it without problem, but suddenly I've reached a point where the filament is adhered to itself and will snap off while printing

I did dry it in a filament dryer, which maybe got too hot? Unsure, but since it seems like other folks are also having this issue perhaps it got too hot during transit.

Maybe Prusa should look into adding temperature stickers to their boxes. I have a Cue reader, and when I get replacement cartridges for it they have a temperature sticker on them that will change color if the temperature exceeded a certain amount in shipping. That would allow at least some ability to know that a spool got hotter than it should have in transit and may have problems.

RE: Prusament PETG filament adhering to itself on spool

I had the same problem with a spool of Jet Black PETG that was freshly opened earlier this week. The roll was manufactured in August this year. 

I've reported it to customer support with photos, and they said someone from the Quality Dept would get back with me in a few days. I have yet to hear from them.

RE: Prusament PETG filament adhering to itself on spool

My spool was made either in April or September this year (Website for the QR code says 4/9/2023 but I don't know if that's M/D/YYYY or D/M/YYYY). Ordered it from Printed Solid last month, opened immediately.

RE: Prusament PETG filament adhering to itself on spool

Posted by: @welnanick

My spool was made either in April or September this year (Website for the QR code says 4/9/2023 but I don't know if that's M/D/YYYY or D/M/YYYY). Ordered it from Printed Solid last month, opened immediately.

I scanned my new spool and it seems it's coming up as d/m/y I have yet to try my galaxy black fillament I better test it

RE: Prusament PETG filament adhering to itself on spool

The date printed on my spool reads 2.8.2023, but when I scan the code the website reads 8/1/2023. My order was placed on August 8th, 2023, so I'm assuming this roll was fresh off the line.

I tried attaching the photo here that I sent customer support, but it wouldn't post.

RE: Prusament PETG filament adhering to itself on spool

I have printed many spools of Inland filament and have never seen anything like that. 
Inland is cheaper and widely available. 

This sounds like another case of Prusa over promising and under delivering 

RE: Prusament PETG filament adhering to itself on spool

Prusa support came through. They are sending me a replacement roll.

RE: Prusament PETG filament adhering to itself on spool

Support asked me to try drying the spool and printing with it again to see if that helps. I have dried the spool but haven't had a chance to print with it yet. I'm hoping this solves the issue, will report back here with the results.