Spaghetti & Collisions?
I ran a print Monday that took ~10.5 hours (.15mm with a .4mm nozzle) that was 30mm high and covered most of the build plate using Inland's PLA+ filament. There were no issues or odd sounds (as the printer is in my office I was around it most of the print.
Now I'm running a 55 hour job (.05mm with a .25mm nozzle using Inland's regular PLA) and sometime between the 30 and 25 hour marks (time left) things went off the rails a bit. I checked it this morning before leaving for an appointment (no one else was in the house either, so not a person or animal causing trouble) and all was well. No odd sounds and nothing looked amiss with the print. When I got home I found 3 things:
1) On one of the parts it sounded as if the extruder was dragging across the already printed material. It still seem to be printing it ok (see item 2 though) and it was not making the same noise on other parts it is still printing. It's been another ~2 hours since I found it with these issues and it has stopped making the noise on that part, but it is now making a similar (but fainter) sound on another part.
2) There is "spaghetti" (see pic) that keeps showing up (I've trimmed some away, but more returned). This is more like it kept extruding while re-positioning than "hairs" like I saw on some other fine detail prints.
3) Unnoticed at first, but I found a part that has clearly been impacted by the extruder, partially melted, and knocked off the print bed (I haven't been able to identify what part it is yet, but I know it is from this print as this is the first time I've used this filament). I mentioned that the last print was 30mm high as this part only reached 25mm before the collision.
I won't know for sure until I can remove the parts and start cleaning them up, but other than the part from #3 and the abundance of "noodles" I don't see anything wrong (so I've been letting it continue).
The two questions I have are A) anyone know what might be going on here and B) shouldn't the crash detection reacted to #3?
Re: Spaghetti & Collisions?
the noodles are likely to be from the top section of the part on the plate that was knocked off as it wold have continued to air print asif it was still there a full plate of parts like this is one of the harder things to learn how to dial in unless you were very lucky with a very flat heat bed. try some of the test prints that print in the extreme corners of your build plate and be sure that all is well in those areas in the meantime try avoiding the placement in the area of the part that was knocked over and print a few less items at a time as your confidence in your skills grows.
Re: Spaghetti & Collisions?
Yeah my first thought was definitely less parts in the future 😉
I get your theory about the noodles and that may be part of it, but at least some are attached to various other parts. The majority are concentrated in left rear corner (pictured and probably where the ejected piece came from), but they are elsewhere too with the majority in the rear half.
Edit: I've finally identified the ejected part and it's one of the taller parts of course... Here is a more recent (like a few minutes ago) pic showing how some the noodles are attached to some parts (this is the worst case).
Edit 2: Ok I finally watched the pattern long enough to understand what is going on between those two pics. You are correct that the noddles are from the missing piece. In the earlier picture everything was low enough that the dangling filament got deposited more readily. Now there are fewer taller parts (and none between where the part should be and the one shown in the second pic) so the filament isn't getting knocked off as "randomly".