Nextruders (multiple tools) dropping burnt blobs of filament
I have a weird and very annoying issue with my XL.
Randomly burnt bits of filament are dropped, causing ugly spots, and sometimes print failures.
I read elsewhere that this would be oozing, but the topic was for a classic nozzle that needed tightening; the XL uses the long nozzles; they should not leak, right?
It couldn't possibly be that I need to replace at least 3 nozzles after only a month of ownership...
Filament is Prusament PETG, Signal White in this case; haven't seen this issue with other colors,
Tool 1 has ever only been used for this filament, this color, I'm at my last spool of 5 kg in total. So the nozzle has only seen at most a mile of filament.
Tools 2 to 5 have been printing Prusa Orange, Natural (Clear), Galaxy Black and Urban Grey, all Prusament PETG, no issues there (although with black; would be hard to tell but not impossible)
Tool 4 has about 2 miles on the clock (that's a lot of glittery black 😉 ), and no issues there.
So is it the nozzle? is it the filament???
I will swap the nozzle for the only spare I was smart enough to order with the printer, but I would really like an expert opinion on this 🙂 The printer is only a month old, the nozzle has never been touched (except the tap test during calibration)
Thank you.
It looks like the fingerprints on your build sheet are causing the filament to lift into the path of the print head where it may be scraping up filament to deposit later after overcooking.
Clean the build sheet; come back if problems persist.
Cheerio,
RE: Nextruders (multiple tools) dropping burnt blobs of filament
Thank you for your reply... what fingerprints?
Build plate was cleaned with Iso before heating up.
I will change my topic title (if I can) though as it seems this is really only tool 1 issue. (also; I can show loads more photos but don't want to overload 😉
I have a small collection of these burnt blobs as I try to remove them when I see them mid print.
RE:
Also; the next print; same procedure; cool down, clean plate, hit reprint, finished near perfect. Not completely perfect.
second photo here is not on the build plate 😉 but still a burnt piece of filament.
again, thank you for the reply, but build plate adhesion is not the issue here. (trust me; I have enough hours on the machine to know when I got my sheet dirty)
RE: Nextruders (multiple tools) dropping burnt blobs of filament
As the print continues on tool 3 (spool join) no more droppings, so it really is the nozzle. Now the big question; is this normal after (checking the stats) 23 days 7 hours of printing (not all on 1 nozzle, odometer on tool 1 is 1.8 km, to set the record straight).
I know now what I need to do, replace the nozzle. Will do that when current print finishes and let you know.
on the right there is a piece of plastic I clipped away, that was on layer 2, with tool 1, tool change happened on layer 4. Clean print afterwards.
RE: Nextruders (multiple tools) dropping burnt blobs of filament
Swapped the nozzle, it (old one) looks fine. Thread is spotless, so the plastic only comes out the hole.
It is very dirty, of course, no cleaning can be done mid-print, and I didn't think to clean it before taking it out.
Single nozzle test now printing, wil be perfect of course, new nozzle, one would expect.
For multi-tool I'll probably need to re-run the calibration ... which I have heard can be an issue with used nozzles (as the tiniest amount of deviation can be a problem ... so I have read)