RE: Nozzle cleaning consistently fails with PETG
Thank you for updating. I thought that this would be the issue in my case, but unfortunately, the cleaning problem occurred on every bed finish(smooth and satin) with every material(pla,pet-g, ASA, PC,tpu). It is so annoying that sometimes it takes 3-4 tries and up to 20 minutes to complete, so if I need to print something quickly, I just use another printer.
RE: Nozzle cleaning consistently fails with PETG
You're missing the point. My nozzle was perfectly clean when it failed. It's not that you have to clean it with a wire brush, the problem is that something is wrong with how it works now, and it should be repaired with the next Firmware update. I repeat, it only happens with a textured plate.
Apologies, my post was aimed at the members who expressed that cleaning the nozzle with a brush was perfectly acceptable.
Not the issue here, but if you think you'll never need to clean your nozzle then you'll eventually have problems. No automated process is going to clean the buildup off of your nozzle, especially when printing PETG, PCCF, ASA etc. If you print exclusively PLA, then maybe, but it will still build up over time around the nozzle and tip.
It's a good idea to check your nozzle before starting your print.
RE: Nozzle cleaning consistently fails with PETG
You're missing the point. My nozzle was perfectly clean when it failed. It's not that you have to clean it with a wire brush, the problem is that something is wrong with how it works now, and it should be repaired with the next Firmware update. I repeat, it only happens with a textured plate.
Apologies, my post was aimed at the members who expressed that cleaning the nozzle with a brush was perfectly acceptable.
Not the issue here, but if you think you'll never need to clean your nozzle then you'll eventually have problems. No automated process is going to clean the buildup off of your nozzle, especially when printing PETG, PCCF, ASA etc. If you print exclusively PLA, then maybe, but it will still build up over time around the nozzle and tip.
It's a good idea to check your nozzle before starting your print.
I'm under no illusion that the nozzle will not need cleaning intermittently, that makes perfect sense. What doesn't, is that a member alluded to the fact that cleaning the nozzle would stop the nozzle clean error reported by a few other members to get the printer to start. Drying filament was mentioned, but was then eliminated in a rebuttal from others. I believe the issue is that oozing was not cleaned from the nozzle before bed levelling causing an error that delayed prints. Having to use a brush to clean the nozzle before a print has started, when the nozzle should be cleaned during the automated startup process was where I was aiming my comment. Please accept my apologies if I have the wrong end of the 3D printed stick, but that's what I was taking from it.
Scott
RE: Nozzle cleaning consistently fails with PETG
Hey dude. Just coz I said it worked doesn’t mean I find it acceptable. But a workaround is a workaround right…?
RE: Nozzle cleaning consistently fails with PETG
After a week of experimenting, here is the workaround that works for me. The problem is filament leaking from the nozzle when nozzle cleaning is in progress and of course during probing routine. To prevent this I just load filament, set nozzle temperature aprox 10°C higher then print temperature of respective material and let the printer 5-10mins at rest. This allows all the content from inside of the nozzle to drain. I just remove the leaked piece hanging from the nozzle (often just drop down itself) and start the print. Nozzle cleaning routine then passes without any problem as well as probing routine which in this case doesn’t leave dots of filament on the sheet. I know, it’s not perfect, but it saves my nerves until Prusa solve this in firmware. Happy printing!
RE: Nozzle cleaning consistently fails with PETG
Put some glue on the nozzle cleaning area, start printing. Works reliable all the time!
The issue is probably under the nozzle cleaning area of the print sheet is no heat bed. The temperature of the print sheet on that position is probably to low!
RE:
I hope they fix it soon, it's been driving me mad the last two days. Textured sheet that's a lot more flexible than the supplied smooth sheet. I wonder if this could be the issue as it is probing right out to the unsupported corner of the sheet.
Normal people believe that if it is not broke, do not fix it. Engineers believe that if it is not broke, it does not have enough features yet.
RE: Nozzle cleaning consistently fails with PETG
I hope they fix it soon, it's been driving me mad the last two days. Textured sheet that's a lot more flexible than the supplied smooth sheet. I wonder if this could be the issue as it is probing right out to the unsupported corner of the sheet.
I struggled with the same issue and the problem is gone now … not a single failure anymore!
What did I do?
I checked the flatness of the print sheet for deviation in Z. Found out that when measuring in the back (the single Z stepper) vs. the two front corners there was a difference of 0,3mm.
So here’s the fix:
1. move the Z axis in the manual menu to zero (all the way up)
2. switch off the motors
3. using your fingers turn all three spindles so that the nozzle tip touches the print sheet in all three corners
4. switch on the motors again
5. re-check
For me it worked perfectly fine, didn’t have a single nozzle cleaning failure in about a week of intensive printing - no matter what sheet or filament type.
happy printing!
Mathias
RE: Nozzle cleaning consistently fails with PETG
That works fine, but you lose it the next time the printer recalibrates the Z-axis. I expect someone will come up with a mod to place an adjustable stop at the bottom of each Z rod.
1. move the Z axis in the manual menu to zero (all the way up)
2. switch off the motors
3. using your fingers turn all three spindles so that the nozzle tip touches the print sheet in all three corners
4. switch on the motors again
5. re-check
For me it worked perfectly fine, didn’t have a single nozzle cleaning failure in about a week of intensive printing - no matter what sheet or filament type.
happy printing!
Mathias
RE: Nozzle cleaning consistently fails with PETG
Didn’t observe that! I think once it is aligned the way I did it it stays correctly calibrated in "z“. At least I measured no change in deviation after z calibration.
Anyway, Prusa should bring the new firmware to life since this is not the only issue. Also found a bug in the slicer software when using the entire buildplate.
happy printing!
That works fine, but you lose it the next time the printer recalibrates the Z-axis. I expect someone will come up with a mod to place an adjustable stop at the bottom of each Z rod.
1. move the Z axis in the manual menu to zero (all the way up)
2. switch off the motors
3. using your fingers turn all three spindles so that the nozzle tip touches the print sheet in all three corners
4. switch on the motors again
5. re-check
For me it worked perfectly fine, didn’t have a single nozzle cleaning failure in about a week of intensive printing - no matter what sheet or filament type.
happy printing!
Mathias
RE: Nozzle cleaning consistently fails with PETG
Didn’t observe that! I think once it is aligned the way I did it it stays correctly calibrated in "z“. At least I measured no change in deviation after z calibration.
I would expect the adjustment to be lost after Z homing. Not sure how often that needs to happen though?
RE: Nozzle cleaning consistently fails with PETG
I was gonna say "I wonder why it needs to heat up the nozzle during bed leveling anyway (because it can cause oozing which leaves small filament marks all of the print sheet)" but then I realized that it needs to heat up the nozzle so it can thermally expand to its printing size and thus give a more accurate z-measurement. ... Or at least that's what I think. Hopefully there's a good reason as to why I've cleaned off small specs of TPU from the bed leveling process the last 20 prints.
RE: Nozzle cleaning consistently fails with PETG
Haven't had my Core 1 long, but it appears it homes to the nozzle prior to the start of the print so z-motors are not bottoming out on anything.
Didn’t observe that! I think once it is aligned the way I did it it stays correctly calibrated in "z“. At least I measured no change in deviation after z calibration.
I would expect the adjustment to be lost after Z homing. Not sure how often that needs to happen though?
RE: Nozzle cleaning consistently fails with PETG
I already found the bed levelling after Z axis homing wasn't the best and relevelled my bed using a business card and the turn each screw by hand with motors disabled method until each point nearby the screws was the same gap (Same level of drag on card).
I just redid it but this time with the bed at PETG printing temperature 85Deg C and there was a little variance compared to cold.
Anyway, the upshot of it is that where yesterday I could hardly get the printer to print anything in PETG, it has now just done its third successful print without failing a nozzle clean.
So definitely give this a go and see if it helps and report back please.
Normal people believe that if it is not broke, do not fix it. Engineers believe that if it is not broke, it does not have enough features yet.