Bearded print
Again good morning all,
this is the other issue that arose from the tacky Bert bust.
In the middle third of the print those "lines in air" artefacts showed up. As I'm pretty sure we didn't have any earthquakes over night it must be something else that caused them. They might be related to the z-seam (set as random) but I can't say for sure. They disappeared again after about 3cm. Did not happen on a test print at 30% height.
Again not very relevant for this specific print. But I am planning on printing more similar sized hollow models, hence it would be nice to avoid further occurrences.
Printer is a MK3, fw 3.9.1-3518, kit built, around 10 months old, print run from OctoPrint 1.4.2. running on a 3B+ under OctoPi 0.17, USB connected. No rattling noises, at least before it happened. I wasn't around while it happened.
Filament is Kiwi3D SilkPLA, spool had been used before, not dried before used but stored in sealed bag with silica gel, no popping moisture noises during extrusion.
The .mf3 is attached to the post about the dropping supports.
Thanks in advance for any clever ideas!
Cheers
Hansjoerg
RE: Bearded print
This happens when a support is needed and is failing. The printer tries to build on top a support that isn't there - dribbles out a quarter inch of plastic that doesn't stick to anything - and the extruder moves to the part and deposits the dribble that should have been left on the support stack.
ps: the extrusion process depends on the plastic sticking to the part - when there is only air under the nozzle, the plastic isn't cut off when the extruder stops extruding - instead, it just hangs there until it hits something solid.
RE: Bearded print
Hi Tim,
the overhang isn't that bad were it happened, but inter layer adherence might be the point. Still strange though that it only happened for a small part of the print (approx. 2.5cm of a 20cm print) and not at the steepest overhangs either.
If it wouldn't be roughly 14 hours to print this thing, I would try with a different filament like normal PLA instead of the silky stuff.
Cheers
Hansjoerg
RE: Bearded print
Remember that where those strings attach is where the extruder moves AFTER it tries printing a failed support. If you are in for a deep dive, look at the slice moves and you'll see exactly where to expect these stray strands to happen.
Again - not overhang related at all. Look at your fellow post about support fails - that one that broke off left air for the nozzle to print on.
RE: Bearded print
palm -> face!
Thanks, now it suddenly makes a huge amount of sense. The nozzle was dragging the extruded plastic around until it caught somewhere and that left the strings dangle around. And depending on when they caught the "beard" is closer or further away from where the support was supposed to be. And it also explains why only a limited part was affected.
Thanks again!
Cheers
Hansjoerg