Under extrusion and clicking noise from the Nextruder
So the machine was assembled by me 4 months ago, was working fine but started making some strange noises and i wanted to lube the linear rail by disassembling it the nextruder and its parts around it.
All went smooth and after reassembly i noticed that during the gearbox calibration a ticking noise appeared as i was screwing the 3 hex screws for the plastic cover.
I back tracked and calibrated again with no issues this time, loaded filament and made about 10 small prints with no issue.
After that though it started under extruding and many hours troubleshooting got me nothing. It appears like the motor has no power to properly pull the filament anymore. Can this actually be the case? Can motors fail like that?
I also noticed that it now a small amount of smoke comes about of the nozzle upon first extrusion, my only guess is that its burning lube, but how?! And why only at the start?
I disassembled the gearbox again to see the PG ring orientation and if i missed anything, all seem OK.
Cleaned the gears from the blackened lube and applied new, reassembled and run calibration with no issues.
Now it cant even properly purge! Tried PLA and PETG.
I will take it apart again, but what am i missing guys?
RE:
That sounds really bad. I would recommend taking it apart again and following this video guide to reassemble it:
Make sure using the PG-assembly-adapter you can turn it by hand.
Also, when screwing the cover down, don't over-tighten or it will cause the PG assembly to bind.
If it's still an issue after reassembling, I'd contact support.
RE: Under extrusion and clicking noise from the Nextruder
Hi Hyiger,
I always follow Ifti's video guides along the Prusa's pdf, same procedure as i can see.
Lets see if 3rd time is the charm!
I can hear a faint ticking noise even in calibration with the hatch opened, cant remember if thats normal though.
RE: Under extrusion and clicking noise from the Nextruder
>> I can hear a faint ticking noise even in calibration
I wouldn't expect it, there is just the stepper motor rotating with the planetary gears, no load or anything else.
You can manually control the stepper in the "Controls" menu, "E" axis.
>> Make sure using the PG-assembly-adapter you can turn it by hand.
I would highly recommend that. It's a bit tricky because there is a fair bit of friction to overcome, especially if the assembly tool hasn't been "broken in" (3d-printed surfaces are rubbing against the planetary gears). This is where I'd focus my debugging efforts. It's possible that teeth are damaged - if you can identify the defect, it may be possible to "rework" the tooth e.g. using key files (also the blunt end for the handle can be useful to bend teeth back).
RE: Under extrusion and clicking noise from the Nextruder
Hello, I had the same problem – the nextruder was clicking and the filament was almost not passing through the nozzle. After a 4-hour chat discussion with PRUSA chat, which in the end led nowhere except disassembling and assembling the nextrudet components, cleaning the nozzle and more and more interventions. Experimentally, when replacing the PLA filament, I chose a maximum nozzle temperature of 209°C and the filament flowed completely normally, the nextruder did not click. When the temperature was reduced to 270°C, the nextruder started to click and the filament did not flow again. From this, I concluded that one or more channels out of a total of four in the high-speed assembly with the HF nozzle from PRUSI is clogged so that it cannot be cleaned or melted. The probable contamination is of a mechanical nature (a burr, a splinter from processing the brass nozzle?). I fixed it this way: I installed an adapter from PRUSI and an HF nozzle from another supplier (3 internal channels). The problem with clicking is eliminated. I print on the HF profile perfectly as with the original.Try this method too, maybe it will solve your problems.Have a nice day.
RE:
Thank you for the replies.
I got curious last weekend and decided to print something with high nozzle temp and see if it flows and pull normally.
Printed a couple of PC and ASA parts i needed done, zero issues, zero noise, zero smoke!
After that i switched back to PLA, it couldn't even purge properly...
Fiddled with the nozzle cleaning needle and finally got it to print an almost perfect Benchy!
At this point i am certain its a nozzle clogging issue, nothing wrong with the nextruder....
I am using Prusa HF 0.4 brass and hardened nozzles and the weird thing is that they both seem to clog lately but i had not have a single clog in the past 4 months....
And have printed a couple of kg's of CF fillaments in the past too!
Maybe its time to try some different nozzles.
Any recommendations?
RE: Under extrusion and clicking noise from the Nextruder
well, the brass nozzle is supposed to wear down after a while... my old nozzle on the mk4s never had signs of failure though but, especially if some more abrasive meterial was used with the brass nozzle, I wouldn't be surprise din seeing a deterioration with possible clogging (especially if some particle got stuck in the relatively soft brass).
I use a hardened nozzle for everything and had no problems so far with a mix of material (ASA, PCBlend, Wooden, PETG and PCCF)
RE: Under extrusion and clicking noise from the Nextruder
I use a hardened nozzle for everything and had no problems so far with a mix of material (ASA, PCBlend, Wooden, PETG and PCCF)
I second that. There is no reason, in my opinion, to run a standard brass nozzle for any material. If you never intend to run an abrasive filament it would be an interesting stat to know that if a hardened nozzle that is (for example) 2x more expensive, does it last > 2x longer. If it does (which I assume) then it makes sense to only use hardened nozzles.
RE: Under extrusion and clicking noise from the Nextruder
Hello,
I had the same problem. Clicking nextruder and after a while the nozzle clogged. I had also a long chat with prusa support but nothing helped. I replaced three times the nozzler without any improvment. At last I replace the complete hotend and after that change the printer works absolut fine. That is my experience.
I hope you can solve your problem.