Issues with prusament jet black pla
I bought a new spool of prusament jet black this week and it is failing and clogging nozzel on prints. When it fails it starts underextruding and the extruder starts it infamous clicking and the filament quits coming out. I try to purge the filament and it wont come out but it will unload. I heat the nozzel to 260 use the needle then do a couple of cold pulls and it works perfect until i print with this new spool of filament. I printed the exact same gcode file with prusament galaxy silver pla and they work perfectly. I changed to the bondtech heatbreak about a year ago and it has not clogged since i installed it. In fact it has worked great. I have tried drying the filament overnight but no change. Any help or ideas would be appreciated i am really frustrated with it.
here are a couple examples of prints i have tried.
RE: Issues with prusament jet black pla
You sure it's PLA and not PETG? This looks exactly what I'd expect from trying to print PETG at PLA temperatures.
RE: Issues with prusament jet black pla
hmm never thought of that. the order says pla and the box says pla but wonder if it is possible it was really petg?? maybe i should slice as though it is petg and see what happens. cant be worse than the current disaster can it?
RE: Issues with prusament jet black pla
just checked the spool also says pla.
RE: Issues with prusament jet black pla
so using your great suggestion i printed one of the failed prints at 245 C. i didn’t increase the bed temp i left it at 60. i was a little worried about setting to 85 if it was indeed pla. any ways it is probably the best jet black print i have done it worked perfectly. is there any way to verify that it is indeed pla as spool and label suggest versus petg?? i am now trying some of the bigger prints that failed to see if they work as well. thanks for your insight i would never have increased temp otherwise.
RE: Issues with prusament jet black pla
There have been a few threads here on how to distinguish between PLA and PETG because it seems to happen more often than one might think. Try googling for it, I don't have references to specific threads handy. Some people say PETG has a distinct smell. I have personally experienced a case of ABS vs PLA mix-up. Stuff happens.
RE: Issues with prusament jet black pla
@stubby - Since you say this is Prusament, you can reach out to Prusa with the serial number. Every roll is supposedly tracked so they my tell you that it was a screw up on their part - it does happen.
RE: Issues with prusament jet black pla
yea i did but they couldn’t say if there was a goof up or not. they wanted a video of me bending it so they could determine if it is really petg. i haven’t had a chance to do that. but i feel pretty confident it is since i don’t think pla would produce a very good print with temps of 260 nozzle and 90 bed. the interesting thing is i also ordered lipstick red prusament pla at same time and it was also petg even tho it said pla?? it printed perfect at temps listed above but clogged and failed every time at 220/60 tenps. so at this point i figure something must be wrong with printer can’t be 2 goof ups so loaded up spool i know is prusament pla and it printed perfect at pla settings.
RE: Issues with prusament jet black pla
Yeah, PETG should bend without breaking almost at perfect 180deg turn. Whereas PLA should break/snap. That is messed up that you got two incorrectly labeled rolls. That is a good thing (and a bad thing). If these rolls are mostly automated, then an error in one should show as an error in the batch that was processed. That speaks to good process in manufacturing where everything is repeatable (even errors - and they do happen); certainly an issue in quality control, but good manufacturing process in place. The bad thing is that in that case there are others out there suffering the same fate as you and probably do not know it.
RE: Issues with prusament jet black pla
That was a great initial "guess" by @fuchsr as well. He nailed it since the very beginning. One would have hoped Prusa would have nailed it before @stubby came to the forum, but that is the reason this forum is such a great place; people like @fuchsr can share their wealth of experience and solve problems fast.
RE: Issues with prusament jet black pla
I know this topic is solved.
But couldn't you just smell if it is PLA or PETG?
I my nose, those have a very different, disctinctive smell when printing.
RE: Issues with prusament jet black pla
I guess it depends on the sensitivity of your nose. I can clearly smell ABS but PLA and PETG, I can't smell a difference.
RE: Issues with prusament jet black pla
yea my sniffer is not that good and covid didn’t help any lol. i can occasionally smell pla but the suspect rolls had no smell i could discern. for me the fact that they printed perfectly as petg (260/90) but failed at pla(220/60) settings was conclusive.
RE: Issues with prusament jet black pla
Well. I guess my nose got, what my eyes are missing... 😋
It was just an idea.
But fascinating (or scary) that somewhere in the production process those filaments could somehow be labeld wrongly in 3 different places.
RE: Issues with prusament jet black pla
lol. i agree that was why i was so suspect of something else being wrong. yea, i thought prusa might have been a bit more interested than they seemed to be. idk. i need to get back to them with the bending of the filament video they ask for, just been super busy.
RE: Issues with prusament jet black pla
I've got the same issue. If I print my gcode with any PLA it works, but with new Prusament Jet Black PLA it won't. I found out it's because of the print speed. The filament can't print at the speed other PLAs can (default Prusa slicer settings). It's definitely batch problem. The previous was fine, other prusaments are fine. I'm solving it with prusa for some time now. My prusament was made on the 5th of december 2022. The filament has significantly rougher surface. Other Prusament PLAs has almost glossy surface, but this one is rough. It breaks if I try to bend it 180°C so I don't think it's simply PETG roll labeled as PLA. This is my test print with the problematic Jet Black and Lipstick red.
I have come here to chew bubblegum and perfect my MINI ... and I'm all out of bubblegum.
RE: Issues with prusament jet black pla
I have exactly the same problem with a reel purchased on 08//20/20023!
This is my 6th spool of Prusament PLA Jet BLack and I have never had the slightest problem with the other spools of this filament nor with any other purchased from Prusa. I tested with other brands...everything works well! But this is really a big problem, the same symptoms, the filament stops coming out of the nozzle at any time (often towards the end of a 6 or 7 hour print Grrrrrrr), it is stuck in the nozzle extruder...a heat blast to 260/270 degrees and by handling it I manage to release it. And it starts again normally until next time!!
I took everything apart to check, I even thought it might be a bad contact on the heating element or on the probe but the firmware doesn't signal anything. Maybe this is a problem on one batch!? in which case I will contact Prusa I think!
RE: Issues with prusament jet black pla
It's PETG extruded as PLA. I'm sure about that now. They just used PETG source material instead of PLA. That's why the surface of the filament is so rough. Even the factory machine struggle to extrude PETG on PLA settings. I use the spool as PETG now and it works as expected. But it's terri le it hapened in multiple batches and prusa still didn't change the processes to make sure it won't happen again.
I have come here to chew bubblegum and perfect my MINI ... and I'm all out of bubblegum.
RE: Issues with prusament jet black pla
thanks
I'm going to try to print it in PETG but I'm not sure it will work.
I contacted Prusa just now....
RE: Issues with prusament jet black pla
I did some tests again with slightly more complicated parts but at 250° / 80°...
and it works very well, no stopping, no blocking in the extruder!