Failing large prints
So, I’ve got my MK3S for about a month and it’s been running great, rounding 150 hours printing time. The other day however, it failed during a large print (the “Master Spool”) in PETG. I then did a “cold plug” and tried again in PLA. The bottom went ok, but it started stringing/missing layers just after (2nd pic). Did a cold plug again, and retried. Second attempt went a bit better but still failed shortly after the bottom was finished (1st pic). I’ve only been using Prusament with matching profiles. Being new, it’s kind of hard to distinguish the different failures. I’ve wasted almost half a spool so far, so I would be greatful for any pointers 🙂
BTW: when cleaning the nozzle, one of the guides told to put in the needle from the bottom of the extruded. A couple of cm up I felt increasing resistance. Is this just the filament or have I made a small hole in the PTFE tube inside?
Also, please correct me if this is not the right forum.
Kind regards
Mark
RE: Failing large prints
Looks like you are trying to print too fast. The extruder is only capable of heating up and melting so much filament per minute. Exceed that threshold and you have having poor adhesion, skipped spots, etc. PETG is worse than PLA for this 'feature' ...
A simple test is to try printing the same gcode again, only this time immediately set print speed to 33% and wait. If you get a better result you have an answer.
ps: I never use a need as it never does anything useful. If you do have a particle blockage, all the needle does is dislodge it - but it is still in the nozzle and will simply flow back into a place it plugs up again. And the hot zone is only a bit more than a cm or so ... any higher and you are into the cold zone.
RE: Failing large prints
Thanks a lot! I was using default SlicerPE values for Prusament 0.2 mm (except for fill pattern), but just did a perfect Benchy so it must be a slicing error.
Also thanks for your advice regarding the hot end. I'll leave the needle in the drawer and hope I haven't damaged the PTFE tube from poking around 🙂
RE: Failing large prints
SlicerPE values for 0.2 mm, has a speed of 200mm(infill), make this 140,
or slow speed,
or heat up the nozzle higher.
I had skipping extruder with pla, temperture 25 higher, and it was gone, also with 200 infill speed, possible not hot enough for the speed of 200.