Strange oozing
Hello all,
I've had my Prusa MK3 for a few years now. Performed perfectly for a looooong time, but now I have a problem that I cannot solve.
I have strange oozing, whatever I do. It's making a very thin, spiderweb-like string. The picture below shows what I get when unloading a filament.
It's oozing before print (ok, normal), but continues doing so when the print is done. I also does this when doing a first layer calibration. It terribly stringy (I get a 50-70 cm long almost invisible filament string) when removing the oozed filament before a print.
I've tried these, more or less in this order:
- Realigned and clean gears
- Using a brand new filament spool
- Using another brand new PLA+ filament spool
- Drying my filaments
- Cleaning the nozzle
- Replacing the nozzle
- Replacing the hotend (with another E3D V6)
- PID calibration
- Replacing the PTFE tube
- Replacing / upgrading the hotend with the Revo (with firmware change and PID calibration)
At this point, I'm out of ideas...
RE: Strange oozing
I don't know if it's just the lighting, but I see yellowing on that filament which suggests to me that your nozzle temperatures may be too high for the filament.
Cheers
-Bob
Prusa I3 Mk2 kit upgraded to Mk2.5s, Ender3 with many mods, Prusa Mini kit with Bondtech heat break, Prusa I3 Mk3s+ kit
RE: Strange oozing
It's a yellow filament. I printed a benchy... It went well, exept for some stringing. It's the constant, background oozing which bothers me...
RE: Strange oozing
Ok, it looks like white filament that's been over heated.
Perhaps your nozzle is worn out and needs to be replaced.
Cheers
-Bob
Prusa I3 Mk2 kit upgraded to Mk2.5s, Ender3 with many mods, Prusa Mini kit with Bondtech heat break, Prusa I3 Mk3s+ kit
RE: Strange oozing
That was one of the first thing I tried. It's a brand new Revo nozzle, and I had tried 2 other V6 nozzled before upgrading the hotend.
Could it be a fan or extruder issue? At this point, these are the only things that I haven't replaced.
RE: Strange oozing
I'm not going to say it's not possible to be your fan, but unlikely. The purpose of the hotend fan is to insure the filament doesn't melt up in the heat break where it could cause a clog, it's meant to keep the heat down in the heat block where the nozzle and heat break meet. Oozing in the hot end is normal, hot plastic being worked on by gravity is going to ooze, I keep a pair of tweezers next to my printer so that I can pluck away the ooze just before the printer begins mesh leveling. What I find weird is that ribbon on the removed filament. I'd chock that up to maybe a particular brand of filament, but you say you get the same results. I can't blame the part cooling fan because you say you have this problem on the first layer and usually the part cooling fan isn't on for the first layer.
I guess, the only thing I can suggest is perhaps see if your hot end is getting too hot, maybe the thermister is failing and allowing the heat block to get hotter than it should.
Cheers
-Bob
Prusa I3 Mk2 kit upgraded to Mk2.5s, Ender3 with many mods, Prusa Mini kit with Bondtech heat break, Prusa I3 Mk3s+ kit