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Printing issues ...
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For anyone who's still reading this - I think I've got it, with a little(?) help from rrr7...
The red PTFE sleeve was pretty scored and damaged, mostly at the hot end.
The theory goes:
The melt was coming back into that part that was scored and reamed out, which would probably be fine if it carried on feeding, However, I had a 5mm retract and that would have been a problem. The cooled filament
by
infodude
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Printing
They were taken with a microscope, problem is it has virtually no depth of field. I'll give it another go.
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infodude
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Printing
Trying to add some pictures in a table using the existing scheme. I'm used to the standard MediaWiki - I'm finding this one a little scary
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infodude
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Printing
Some more pics if you want to use them. Sorry if I posted in wrong place - please advise.
Feed rate too high
Seen from 45o angle shows it up better on 0.5mm thin wall cube that Slic3r made to 0.7mm, coming in at around 0.9mm!
and after correction to Extrusion Multiplier coming out at the desired 0.7mm:
Will try to add to Wiki when my confirmation email comes thru
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infodude
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Printing
OK, signs so far are that it's back to its old self! Sadly when I tried to tweezer-off the ball to put it under my microscope, showing itself to be molten metal also caused its demise...
Check out RIchRap's blog entry 19 June 2012 or Google "jammed-frggn-nozzle" for previous.
Also sadly, I'd put gold and grey filament through it from 2 different suppliers before it failed, so not wanting to inc
by
infodude
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Printing
Update - this was possibly started when a small ball of metal got stuck in the nozzle!
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infodude
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Printing
Oh! Just taken apart the nozzle (again) and found a tiny little silver ball in there! I've read about this before, little balls embedded in filament, and assumed it was a catastrophic manufacturing failure and probably a one-off. Perhaps not...
I'd heated the block with a small torch to burn off filament before cleaning, and upon touching the ball it was molten... solder then? Not from my kit, s
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infodude
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Printing
Thanks for the excellent reply
I've since checked the nozzle temp by ramming a thermocouple into the hot end and comparing - same to 1oC so not that.
Strangely yes, replaced the entire J-Head assembly, although they're different specs - the first had fatter inner tube with hollow bolt, the second a thin PTFE tube with no retainer.
I really like the backflow-to-wide-region idea. Another post I
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infodude
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Printing
Here's the tube from inside my J-Head:
and here's inside the bit that points into the hot end:
I'm guessing it looks a little on the rough side. Any suggestions as to what kind of abuse would cause this?
Thanks,
Phil
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infodude
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Printing
Hi all,
Been printing in ABS every day since Oct last year. I've had a few filament strippings in that time, and only ever needed to yank out the cooling filament from the J-head for "cleaning". Last week that method stopped working, the prints were constantly beading or stopping as the filament struggled to feed. I ended up dismantling and cleaning the nozzle for the first time, but on reassemb
by
infodude
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Printing