MK3S+ Large glob and stringy filament appeared on print mid-print and print was subsequently knocked off the hotbed
So I started an 11-hour print on my MK3S+ and then walked away for about an hour. When I returned I found that my print had been completely knocked off of the hotbed while the printer attempted to continue printing on the now empty hotbed (though no filament seemed to be actually coming out). When I retrieved the failed print, I saw that there was a large glob of filament that had formed on the print. Furthermore, there were also some stringy strands of filament present on the failed print. Any idea what would cause a glob like this to appear during a print? And why would it be completely knocked off the hotbed? Any help with this issue would be appreciated.
Here's an image of the failed print:
RE: MK3S+ Large glob and stringy filament appeared on print mid-print and print was subsequently knocked off the hotbed
Upon further inspection the extruder head was also cloggrd with d similar blob. I cleaned it out completely and tried doing anothet print, only for the exact same issue to happen.
You have a blob of doom. Search for blob of doom to see how others have dealt with them.
Before doing anything, look at pictures of a clean extruder and note the position of the rather delicate wires that are currently hidden, if you damage them you will have to buy replacement parts as broken wires can't be rejoined.
You have probably damaged your fan shroud and will need a replacement.
To remove it:
Raise the nozzle temperature to the printing temperature for the filament in question and allow it to heat for several minutes.
If you are lucky you will be able to prise the blob open - more likely you will need to add heat from outside with a heat gun to aid the softening, sometimes it's worth using a soldering iron to carve chunks off the mass.
Use needle nosed pliers to prise this away; remove it in parts if it won't release the wires.
Once you have the worst removed you decide whether you need to disassemble the extruder to get at all the blob or perhaps you can clean up in situ.
After the cleanup there will be overcooked filament inside the nozzle so at least a purge and probably a cold-pull will be necessary.
The cause is often a head crash into a loose print due to either poor adhesion or warping. After the head cleanup a thorough clean of the print sheet and possibly a review of the part to decide if a brim might help are advised.
Cheerio,