Nozzle oozes
Hello everyone,
this is my first post here. I just assembled my printer a few days ago. Up until now all was great, assembly went really well, however, it seems I´m having a little oozing problem... I´m afraid, as this is my first printer I´m still quite inexperienced and this might be a stupid question, but I couldn´t find any obvious answers in the forum or the all-knowing internet.
It seems my nozzle likes to ooze filament as soon as it heats up. There is always a few mm filament that gets stuck on the tip and will either be scrubbed of during the purge or on the first layer. If it is the latter this sometimes disturbs that layer so much that the print fails, sometimes I can pull it off quick enough... On some prints this seems to even happen during later layers. I specifically tried to rule out any Splicing issues and was using the test gcodes that came with the printer. Same issue...
Any ideas?
Re: Nozzle oozes
Hi Dennis
There will always be an amount of filament oozing when the nozzle is hot and away from the bed.
The priming line prior to printing the model compensates for the loss.
Heating the nozzle in the homed position will prevent most of the oozing; a small amount of filament will come out and form a blob on the bed then nothing else can ooze.
What I do is to heat the nozzle to 170 degrees (to soften any filament on the nozzle), run the 9 point calibration and then heat to print temperature when the nozzle is homed and finally print the priming line followed by the model.
Start GCode for this is something line this:
M140 S<BED> ; Heat the bed + 5 degrees for Mk2
M104 S170 ; Warm it up to calib temp
G28 W ; Home all (no calbration)
M109 S170 ; Warm it up to calib temp, and wait till it's warm
G80 ; mesh bed levelling
M109 S<TEMP> ; Warm it up to print temp, and wait till it's warm
G1 Y-3.0 X50.0 F1000.0 ; go outside print area
G1 X100.0 E5 F1000.0 ; intro line
G1 E-0.5 Z2 F1000 ; Retract a bit and lift nozzle
NOTE: code above is for KISSlicer.
Peter
Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…
Re: Nozzle oozes
Hi, Dennis,
Mine does the same,
for example after you load filament there is an initial spurt of filament which is expected, then if you confirm the extruder has stopped feeding, clean that off, I notice a trickle of filament which needs wiping off too...
similarly if I change filament during a print... there is an additional trickle after the extruder stops driving...
NOTE This is not the prime for the next layer, because I edit that out of the gcode.
I didn't get this issue with the Mk1 extruder... so it seems to be a feature of the Mk2
I resort to multiple wiping of the nozzle before commencing or recommencing prints...
I print mostly PLA, and I find that 200degrees nozzle temp works fine for my filaments and reduces stringing significantly.
Hope you cn find a resolution for your issue.
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
Re: Nozzle oozes
Hi Peter,
but should it ooze so much that it leaves a small dot of filament on every of the 9 calibration points while doing the leveling before the print? Because that is happening to me pretty often.
Re: Nozzle oozes
Dennis
Yes, that is what happens and the reason why I use a nozzle temp of 170 degrees for the 9-point calibration and then heat to printing temp afterwards:
M140 S60 ; Heat the bed + 5 degrees for Mk2
M104 S170 ; Warm it up to calib temp
G28 W ; Home all (no calbration)
M109 S170 ; Warm it up to calib temp, and wait till it's warm
G80
M109 S215
Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…