RE: Immediately severely clogged after only 2 test prints
I haven't experienced any nozzle clog since I have started to use filament dust filter years ago.
I had only two clogs in my maker's life.
The first one was back in 17 and was caused by the foam of my dust filter (the exact same you posted!) that started to desegregate due to the filament rubbing over time. It was challenging to clean-up because the burnt foam is more sticky on the nozzle than on the filament. It took me about a dozen of cold pull to get it clean, I never ever used a dust filter since.
The second clog was during the 20s lockdown (😷) and was due to a crumb of cardboard, detected by the machine, solved by a single cold pull. Never experienced clog since, I often think that I am lucky when I look at the dust on some of my spools. 🤭
Filament breaking is another story. It looks like here peoples are facing to filament snapping, not a real clog. I noticed that the portion of the filament that has been dented by the extruder becomes more brittle when straightened. It is a general observation, not specific to the CORE One. It's like a pre-cut packaging, without this small notch you almost can't open it or you need to bite the plastic with your teeth.
I'll be curious to know if the new unload procedure from the recent firmware has worsen this issue?
RE: Immediately severely clogged after only 2 test prints
I too am having issues with clogs using my brand new Core One using stock settings. My third print on the Core One stopped sending out filament with a loud clicking sound. After reading the comments here, I took a look at the internals and found the Galaxy filament had snapped. More troubling, the intake drive thingy (sorry) is already showing signs of chipping from the Galaxy PLA! Same issue with PETG as well -- I've started trying to use the standard-flow nozzle in my settings hoping it will reduce the issue.
I love Prusa and what it stands for, but I'm really bummed out that my new printer is having issues out of the box!
RE: Immediately severely clogged after only 2 test prints
Here's a photo of the wear I described above
RE: Immediately severely clogged after only 2 test prints
More troubling, the intake drive thingy (sorry) is already showing signs of chipping from the Galaxy PLA!
Hmm, that looks disconcerting in a new printer. Is it really the metal teeth wearing off, or could it be chips of glittery plastic sitting between the teeth and on their flanks? Maybe try whether you can push them away with a wooden toothpick or (if you happen to have one around) a very small brush with brass bristles.
Are the idler screws adjusted to spec in your Core One, or are they possibly too tight?
RE: Immediately severely clogged after only 2 test prints
Sigh. I am in the same boat. Printed several kg of PLA, PETG, and some ABS. Decided to try the Galaxy black that was included and snap, with no bits hanging out that I can tug on...
RE: Immediately severely clogged after only 2 test prints
Can't you just heat the nozzle and push it through?
RE: Immediately severely clogged after only 2 test prints
Can't you just heat the nozzle and push it through?
Yep. I clogged my 0.25 nozzle a few times now (but I just love the results). What worked was to set the print fan to 50%, open the extruder lever, set the nozzle to 270°C for PLA and then go to "move axis" and slowly turn the Extruder "axis" clockwise, while pushing the filament (still loaded and on the spool holder).
Takes a bit of careful force and doesn't smell great, but works in most cases. Without the print fan, it smells a lot more and it "blobs more".
As soon as the blob is out, set the temperature to 0° and keep the filament moving until the nozzle is below around 220°C, to not risk the next blockage due to heat creep.
RE: Immediately severely clogged after only 2 test prints
I pulled the extruder, heated it up to 270 and the filament expanded enough to pull out the top. Unfortunately it left a lot of crud inside that is resisting new filament.
RE: Immediately severely clogged after only 2 test prints
Managed to get a drill bit down into the tube and ground out a lot of the crud. Got some clean PLA to run through it to release the remaining as smoke. Just did 3 PLA and 3 ABS prints with no issue now. I really think it was that Galaxy Black that caused the problems, evidenced by this earlier progression of print failures:
RE: Immediately severely clogged after only 2 test prints
Well let's add another clogged nozzle to the team same problem just finished to assembled my kit and get nice printer with Prusa filament but once I switch to Galaxy Glitter start clogging, another thing the filament finished and the printer did not stop pfff
As were could see is just break in two bottom and up
RE: Immediately severely clogged after only 2 test prints
I am the OP and after some further months of, I am utterly disappointed with this printer.
I mostly tried to use this printer for miniature figures & scenery printing with PLA. The first weeks I was delighted about the results I achieved with the standard 0.4 nozzle. Then it went downhill quite fast with constant clogging and PLA breaking off. I bought a preassembled printer but I can't even count the number of times now I had to dissassemble the nextruder and get the nozzle out to try to free up stuck pla. I am using prusa PLA only.
A summary
- the included 0.4 HF nozzle is blocked in such a way I cannot seem to get it freed up ... tried everything but simple remains stuck somewhere mid.
- switching to 0.25 nozzle worked for a couple prints and then the same issues started
- same for a 0.6 HF nozzle
- since the latest upgrade I cannot get anything printed anymore - might be a coincidence - every print fails with stuck PLA and the printer happily continueing printing 'thin air' without any error or whatsoever.
- Every time this happens, I can then start the process of trying to unclog the nozzle - I waisted hours and hours now for what ...
In the meanwhile, my Prusa MINI - which just stands besides the CORE - thus in exactly the same room conditions - happily prints using a 0.25 nozzle without any issue whatsoever.
I will probably try one more time with customer support - although I do not see what can be remedied - this printer is just terrible with PLA it seems and does not at all justifies the amount I paid for it ... should have gotten that Bambu after all.
Very disappointed in Prusa ...
and PLA breaking off.
How are you drying your filaments?
Cheerio,
RE: Immediately severely clogged after only 2 test prints
The general trend is definitely not that the Core One is terrible with PLA. The extruder design is the same as the MK4 and that printer was also very good with PLA.
Because of the heated chamber, there is a risk of heat creep if the printer is in a hot room. The chamber can then not be cooled down enough and it might help to open the door.
PLA can turn brittle when wet, are you sure you are completely drying your filament? Especially if the idlers in the Nextruder are too tight.
RE: Immediately severely clogged after only 2 test prints
High all. I have the same problem after a while the extruder is clickimg and if I not stop the print the nozzle is clogged. I tested with different PLAs and the result is is every time the same. Sometimes fast and sometimes it takes a little bit longer. As I read the above post it could be a heat creep. So I remove the top cover and let also the door open but no improvement. I'm a liitle bit frustated. It seems to be not a prinzipal problem for all users but I hope Prusa find a solution or workaround.
RE: Immediately severely clogged after only 2 test prints
Hi, thanks for your feedback.
'Drying filament' ... a new pandorra's box opens for me it seems 🙂
I have never dried my PLA and never had a reason to do so it seems. The MINI just prints fine - in the same room. Also I am a bit confused as PRUSA seems to indicate in their article about drying that PLA is the least affected and therefore probably drying is not needed.
Now ofc, you do make a couple of good points about the CORE design and its over heating potential. It might at least explain on why it is happening now for all my nozzle sizes as it is ofc summer time and the room temperature is alot higher then when I first got the device ( end of January if memory serves me well ).
I am also using a spool which is almost at its end, so it has been sitting on the printer and in the room for a while now. So theoratically, if I would use a brand new, still packaged spool, then it should be better ?
Thanks,
Steven
The Mini - and all bedslingers, flex the feed filament in one dimension. The Core One - and all corexy machines flex the filament in two dimensions and the Core One in particular inflicts a sharp bend just before the extruder. As PLA becomes brittle when damp the Core One is particularly likely to snap the filament - and HF nozzles are probably more sensitive to internal pressure disruption when moisture boils off.
PRUSA seems to indicate in their article about drying that PLA is the least affected and therefore probably drying is not needed.
How much drying is required very much depends on your local climate. All filament MUST be dry before use, PLA takes longer to deteriorate than some ... in the winter, when the heating is in use I can leave a spool open for a week without problems but in the rest of the year even freshly dried PLA can deteriorate within the duration of a long print so a second print from the same spool will fail if not dried again first.
That's an old article btw, it predates the Core One. I think some of the 'PLA is OK if left open' mindset goes back to early printers which were inherently less accurate so the deterioration was less obvious.
As a basic rule, for any molten plastic work; dry it first.
Cheerio,
RE: Immediately severely clogged after only 2 test prints
Packaged and new does not guarantee dry filament. Wet PLA can be more brittle but also create small defects due to water boiling off in the nozzle.
It's always better to dry filament but in some environments the difference is small.
RE: Immediately severely clogged after only 2 test prints
I had freshly dried PLA snapping between the spool and the extruder on my mk3s within 3 weeks.
My printer is in a normal room, 3rd floor, Northern Germany. Always 20-24°C, humidity between 40-60%.
"PLA is takes a long time to become wet/brittle" my a**.
Sorry for the wording, but lots of issues went away when drying every single roll, no matter if fresh and sealed or not and then putting them into a DIY cereal drybox with fresh or freshly dried, clear silica gel balls.
RE:
My five cents after several years printing with a Prusa Mk3S+ and two non Prusa Core XY printers:
I never had a real problem related to moisture with any PLA spool from half a dozen of different brands (Prusament, Fillamentum, Overture, Polymaker, Esun, 3Djake.. ). No snapping, huge stringing or blobs. It is true that PLA becomes brittle after being exposed to moisture for a while but it takes long. In my experience at least two-three months, not just a week. In fact, I’ve never dried any PLA spools I printed with and none of them become, should we say, “real bad”. Maybe the ones that lasted longer since I started them showed more stringing at the end of the spool, but on quite an acceptable level.
Total different story with most other types of filaments. None of them can be left outside a sealed bag with desiccant. From better to worse : PETG, ASA, TPU, PC, PA,
Printing PA and PC I always dry the spool before the job, regardless of if I printed only a couple of days ago and the spool was kept in a sealed bag. TPU is not quite so bad ( at least, the brand I use ). ASA and PETG, endure better moisture but if you don’t dry the spools on a regular basis, it doesn’t takes long before you start to see a deterioration ( some blobs here and there, increased stringing ).
RE: Immediately severely clogged after only 2 test prints
Hi folks,
yesterday I have a long chat with the support of Prusa. I have send a mail to prusa support and they ask me to measure my Thermistors and give the result to the chat. I make it short. The result of the measures was that the values are in range. I make a special nozzle cleaning with the support and startet after that a new print. Unfortunately no improvement. They will send me a new nozzle. I keep you inform.
Many happy printings