RE: "Nozzle Cleaning Failed." Error
I found this thread when I got the problem mentioned her - nozzle cleaning error. Could not figure out what was wrong until today.
Tried a coold-pull, but the nozzle turned out quite clean - so I took out the heat-block and nozzle-unit.
My problem was that the nozzle was loose in the heat-block. This was a new heat-block and nozzle (0.6mm) unit I had mounted aftermarket.
I obviously did not screw the nozzle tight enough into the heat-block so it had become loose after some hours of printing.
Tightened the nozzle in the heat-block and my printer is back in business after my user-error.
- just in case other having problems.
RE: "Nozzle Cleaning Failed." Error
I spent a total of 6 hours on chat with tech support and they sent me a new heatsink/loadcell but it didn't fix it. Sent them lots of pictures and loosened and tightened all the things they told me but nothing fixed it. I eventually broke the appendix on the Buddy board and downloaded my own copy of the firmware with the nozzle cleaning removed. Now the printer works perfectly. The nozzle cleaning code has nothing to do with nozzle cleaning. It is doing a bunch of movement calculations that I can't figure out (no comments in the code) and those calculations fail for some reason. If the developers ever get it touch with me, maybe we can figure out why it doesn't work on my printer and it might help others, too.
RE: "Nozzle Cleaning Failed." Error
That's really interesting.
In my case, they sent me a new loadcell and it didn't fix it.
We ended fixing the problem by changing the loveboard. The new one I've received was a different version of the one I got in the original kit.
Since then I've got 0 cleaning error.
RE: "Nozzle Cleaning Failed." Error
I didn't see any bugs or issues in git around that.
Would you be able to write one, so we can upvote them?
RE: "Nozzle Cleaning Failed." Error
"I spent a total of 6 hours on chat with tech support and they sent me a new heatsink/loadcell but it didn't fix it. Sent them lots of pictures and loosened and tightened all the things they told me but nothing fixed it. I eventually broke the appendix on the Buddy board and downloaded my own copy of the firmware with the nozzle cleaning removed. Now the printer works perfectly. The nozzle cleaning code has nothing to do with nozzle cleaning. It is doing a bunch of movement calculations that I can't figure out (no comments in the code) and those calculations fail for some reason. If the developers ever get it touch with me, maybe we can figure out why it doesn't work on my printer and it might help others, too."
Please post this on the Github for the 32 bit Prusa boards. It then MAY get fixed.
I am starting to believe that the XL and the MK4 are a work in progress, and not a finished product. The hardware works, but the software has problems.
Steve
Senior Life member of IEEE.
RE: "Nozzle Cleaning Failed." Error
I spent days troubleshooting and it still failing. Prusa NEVER offered to send any hardware. I threw out my box because my Mk3 and Mini boxes sat for a few years before I threw them out. I've just been setting on a dead printer. Why do I have to ship it from WV to CZ? I thought Prusa had Printed Solid or "Prusa Academy" folks in the States to fix issues??? Sending a few parts would be cheaper, and I can send back the old/unused parts.
I truly wish I never bought it.... I didn't want another bed slinger, I converted an XL reservation because the MK4 dropped off of nowhere.
RE: "Nozzle Cleaning Failed." Error
Yes, there is a Prusa Github issue thread on this exact problem and I have posted there.
RE: "Nozzle Cleaning Failed." Error
It's been happening a lot with me lately when printing PETG I've noticed it happens most when i try to preheat. I think there's a bug with preheating before printing that might mess up the temperatures for other materials and reset them to 170...
RE: "Nozzle Cleaning Failed." Error
This failure is really annoying. Even with brushed Nozzle i need a few tries to get the print done with PETG. Wish i had not sold my mk3s+ that ran through many hours of printing. I also struggle with VFA. With and without input shaping.......
RE: "Nozzle Cleaning Failed." Error
Change your starting gcode in profile from 195 to 170 for PETG nozzle cleaning and this helps.
TAB Printer settings -> own G-code -> find line starting from M140
M140 S[first_layer_bed_temperature] ; set bed temp
M104 T0 S{((filament_type[0] == "PC" or filament_type[0] == "PA") ? (first_layer_temperature[0] - 25) : (filament_type[0] == "FLEX" ? 210 : (filament_type[0]=~/.*PET.*/ ? 195 : 170)))} ; set extruder temp for bed leveling
M109 T0 R{((filament_type[0] == "PC" or filament_type[0] == "PA") ? (first_layer_temperature[0] - 25) : (filament_type[0] == "FLEX" ? 210 : (filament_type[0]=~/.*PET.*/ ? 195 : 170)))} ; wait for temp
Change those two to 170
M140 S[first_layer_bed_temperature] ; set bed temp
M104 T0 S{((filament_type[0] == "PC" or filament_type[0] == "PA") ? (first_layer_temperature[0] - 25) : (filament_type[0] == "FLEX" ? 210 : (filament_type[0]=~/.*PET.*/ ? 170 : 170)))} ; set extruder temp for bed leveling
M109 T0 R{((filament_type[0] == "PC" or filament_type[0] == "PA") ? (first_layer_temperature[0] - 25) : (filament_type[0] == "FLEX" ? 210 : (filament_type[0]=~/.*PET.*/ ? 170 : 170)))} ; wait for temp
After this modification and with sating or texture sheet I completely close issue with nozzle cleaning.
On Smooth PEI even with 170 deg. of Celcius can happen that bed leveling will still leave this shity dots where nozzle touch bed for measurements.
RE: "Nozzle Cleaning Failed." Error
I just started getting the dreaded nozzle cleaning failed error too. First I have to run back and forth to get past the notification of and updated firmware and then I have to run back and forth to reset the printer because of the nozzle cleaning failed error. I have probably printed less than 40 prints so far on my factory assembled MK4. So what is the final verdict that fixes the problem?? This is very annoying.
Thanks
RE:
Yes, there is a Prusa Github issue thread on this exact problem and I have posted there.
Link please.:)
Thanls
RE: "Nozzle Cleaning Failed." Error
A link won't help you because the Prusa Github issue thread is only for REPORTING problems. Hopefully, in the next iteration of the firmware, the problem will be solved. In the meantime, you can try some of the things in this forum thread. Personally, my solution seems to work for me (see my postings). YMMV.
Senior Life member of IEEE.
RE:
Thanks Steve. I am printing now but every print with the same PETG I have been using for a while (2nd spool) does the same thing, but after a reset after the error is usually works.
p.s. I found a link:
https://github.com/prusa3d/Prusa-Firmware-Buddy/issues/3347
A link won't help you because the Prusa Github issue thread is only for REPORTING problems. Hopefully, in the next iteration of the firmware, the problem will be solved. In the meantime, you can try some of the things in this forum thread. Personally, my solution seems to work for me (see my postings). YMMV.
RE: "Nozzle Cleaning Failed." Error
Great. Now you have the Github link. It won't do you much good, since that link is only for reporting problems that hopefully the developers will fix. You can try my solution: After you load a model, go to settings and lower the hotend temp to 180 degrees. Take a brass brush and get all the filament off the nozzle. Then let the nozzle heat up to the 180 and do it's nozzle cleaning. It will go thought some motions, but since you have cleaned the nozzle, it won't amount to much. Then the printer will go throught the bed leveling calibration, and then wait until the nozzle heats up to the PETG temp. Then it will start printing normally.
The error seems to occur when a piece of filament keeps the nozzle from going down to the bed (the printer know where the bed is from previous calibrations). By cleaning the nozzle and lowering the temp prevents the PETG ooze and gets the remaining PETG off the nozzle.
It's a pain, but it works for me. Hopefully, they will fix this in the next release of the firmware. Other than that (and the problems with Octoprint), the MK4 seems to do what it is supposed to do (which is about all you can say of anything). Input shaping really does make the printer run faster (except for the first layer).
Steve
It seems that they MK4 and XL (basically same firmware) are works in progress. Hardware is easy, software is hard.
Senior Life member of IEEE.
RE: "Nozzle Cleaning Failed." Error
They are sending me a new loveboard based on @argh-2 experience since the new heatsink/loadcell did not fix it. None of the PETG suggestions would apply to me because I am using PLA. Let's see if the new loveboard fixes the problem.
RE: "Nozzle Cleaning Failed." Error
Thanks for the added info. I will be playing around with it later today. I will update the firmware to get rid of the notification of a new firmware that stops the printer from starting a print after a remote send using Prusalink. The weird thing is that nothing has changed since the last time I used the printer. It's in a Prusa enclosure and using the same spool of filament from the previous run. It also seems like it was having trouble sensing one of the startup calibrations with an end stop but I only seen that once and didn't pay much attention as I was resetting the printer. And then I started thinking how much of a pain it will be if I have to start changing parts without removing the printer from the enclosure. 😆
Great. Now you have the Github link. It won't do you much good, since that link is only for reporting problems that hopefully the developers will fix. You can try my solution: After you load a model, go to settings and lower the hotend temp to 180 degrees. Take a brass brush and get all the filament off the nozzle. Then let the nozzle heat up to the 180 and do it's nozzle cleaning. It will go thought some motions, but since you have cleaned the nozzle, it won't amount to much. Then the printer will go throught the bed leveling calibration, and then wait until the nozzle heats up to the PETG temp. Then it will start printing normally.
The error seems to occur when a piece of filament keeps the nozzle from going down to the bed (the printer know where the bed is from previous calibrations). By cleaning the nozzle and lowering the temp prevents the PETG ooze and gets the remaining PETG off the nozzle.
It's a pain, but it works for me. Hopefully, they will fix this in the next release of the firmware. Other than that (and the problems with Octoprint), the MK4 seems to do what it is supposed to do (which is about all you can say of anything). Input shaping really does make the printer run faster (except for the first layer).
Steve
It seems that they MK4 and XL (basically same firmware) are works in progress. Hardware is easy, software is hard.
RE: "Nozzle Cleaning Failed." Error
I hope that fixes it as it should not be too hard to replace that even in an enclosure. Did your problem just show up one day without any changes to the printer or slicer or material you were using?
Thanks
They are sending me a new loveboard based on @argh-2 experience since the new heatsink/loadcell did not fix it. None of the PETG suggestions would apply to me because I am using PLA. Let's see if the new loveboard fixes the problem.
RE: "Nozzle Cleaning Failed." Error
It is my observation that you get the error when the printer tries to do a nozzle cleaning and something is blocking it from touching the bed.
It seems to be a firmware problem. I don't believe any amount of hardware swapping will fix the issue.
My work-around for PETG prevents the PETG ooze from getting on the nozzle, and I have to make sure there is no filament underneath the nozzle when it does the nozzle clean. For any other filament, you want to lower the nozzle temp and clean it with a wire brush to get all the residual filament off before it does the nozzle check.
Senior Life member of IEEE.
RE: "Nozzle Cleaning Failed." Error
It's interesting that some folks are finding that they need to set PETG pre--pre-heat to 170 from 195. A few weeks ago, it was at 170 (and they upped it to 195). I had a situation where some PETG oozed out and got hardened into a little arc that didn't break off. The printer went through the entire routine touching the tip of the filament to the bed, then started air printing.