Oh my!
I was cleaning off the hot end prior to starting a new print when I noticed some melted plastic around the hot end. Upon closer inspection I saw that a big wad of plastic was stuck to the hot end above the lower heat shield. So I took off one of the screws holding the shield and saw what is in pic #1.
Somehow a bunch of plastic had gotten stuck above the lower heat shield and completely filled in the space above it. What a surprise! So I simply did a Preheat to 200 and pulled it off. I used an alcohol wipe to clean of the small amount of plastic left and reassembled the heat shield. Pic #2 shows what came off the hot end.
The entire cleaning/fixing process took about 15 minutes. I found it handy to disconnect all the magnetic rods except the front 2. This holds the printhead at a convenient height and also allows you to move it around for easy access.
翻譯年糕
André Medborg
2015-12-01 04:30:05
It seems like your hotend tip is not screwed together probarly, like it oozes out between the heater element and the metal.
André Medborg
2015-12-01 04:35:50
Your side cooling fans are turning so that they pick up the hotter air from inside the hotend array. Is that on purpose? It cools much better if they suck air from outside. If that makes any sense.
André Medborg
2015-12-01 04:37:02
That has nothing to do with the oozing, mearly an observation.
Birk Binnard
2015-12-01 04:49:00
Hi
André
Thanks for your feedback. The printer has been printing for almost 2 hours and there is no evidence of melted plastic oozing out from the hot end, so I am not sure where it came from. But I'll check again in another couple of hours just to
make sure.
Yes, I am aware I installed the 2 side-blowing fans backwards, and I understand completely how this affects their filament cooling ability. I've been procrastinating turning them around because the hot end assembly is difficult and time-consuming to take apart and put back together - those tiny screws and nuts are really a challenge. But I will get around to it one of these days.
PS: I'd love to see the machine that makes those tiny screws and nuts. I've never seen anything like them before - except in the watchmaking business.
André Medborg
2015-12-01 05:01:59
Ha, ha, you are right those tiny bits are a pain.
Clarence Lee
2015-12-01 08:38:30
It`s usually not ooze from hotend. Its sticky back when print wents wrong when previous printed path didn`t stick well.
Birk Binnard
2015-12-01 12:53:51
Clarence: I think you are correct. The print before my last one did go bad - it got unstuck from the Zebra plate because I forgot to include a suitable skirt. I didn't catch the problem until after the printer had been producing a bunch of spaghetti for about 15 minutes.
It never occurred to me to look for anything like what I found later. So I have learned yet another lesson about 3D printing.
Joschka Friedl
2015-12-01 19:14:37
Can confirm what Clarence said. Started a print, went away for an hour, got back and he printed a spiral of spaghetti. After a second look I saw that the whole windshield was filled with filament.
:)
But thats no big deal, remove and go on
:)
