Hi everyone, it seems I have an extrusion issue… Maybe the extruder motor is out of order? I can’t extrude anything and if filament is extruded, prints are horrible…
I have a P1S since 6 months right now. Indeed, I bought a new 0.4 nozzle and a new extruder, all in hardened steel. I proceeded with the installation, then the calibration, everything went well.
However, when I try to print a simple Benchy, the result is very bad. I don’t understand what’s going on despite having installed a brand new extruder, and a brand new nozzle.
Of course, I changed nozzle settings and choose 0.4 hardened nozzle…
I also tried with several filaments with and without AMS… I also cleaned all axis, fans, replaced PTFE tubes, done belt tensioning procedure and have done a Bambu Studio calibration… nothings. In addition, I have done a manual test extrusion and the result isn’t so good… you can here the noise each time I click the manual extrusion button as shown in the picture attached…
I opened a support ticket 3 days ago. Waiting for their reply…
Thank you in advance for your feedback. I attach some photos and videos because I find that there is still a very strange noise in the extruder.
Probably not that good, but I can’t imagine that it’s still the extruder, since it looks like you’re pretty much done with troubleshooting the extruder - but there will certainly be observations and tips from others. I just want to tell you something as quickly as possible, as a moral aid
First thought and now I could may way wrong: On the back there is the TH board that controls the extruder motor. Also a small gear on the motor shaft that then drives the extruder on the front. Loose contacts, motor wiring, etc? Possibly defective extrusion drive motor? I have question marks too, let’s wait and see what others think. Ceramic heating plate with contact paste? Temperature of nozzle seted on a higher temp. to try at max. temp. (just to rule out resistance and insufficient melting and thermal breakdown, short temperature drops)?
It can get tricky, it happens to everyone sooner or later. That’s pretty much the reason why I like printers, where you can always change the entire print head quickly and don’t have to search everything, small consolation but in the end you’ll find it and get better because of it… patience, peace and time and at the end it will work again.
I tend to agree with @Hank in that the extruder is probably not the issue. You can check it by feeding with the nozzle removed to you can manually “extrude” a filement using the display.
My guess as to a possible root cause may be worse though. It looks like the nozzle is not actually achieving the indicated temperature. So with both a new nozzle and extruder, it may be the connectors or the board itself.
Hope it is something simpler though. Such as a travelling contaminant in the ptfe/extruder/nozzle path. But again, with a new extruder and nozzle…
Thank you @EnoTheThracian , so, according to you and @Hank , this should be the toolhead board? Not the extruder motor?
I don’t understand why, when I hit the extrude button manually, there is this strange noise and at the beginning the filament came out but after 2 or 3 hits, nothing anymore… Any idea?
It is very difficult to say from afar tbh. The benchies look like nozzle temp was an issue. The videos indicate god-knows-what. Does the yellow gear turn consistently when you do a manual feed?
If not, there may be further troubleshooting to be done on the extruder, in particular the motor shaft. Any sign of slipping?
If I understand you correctly, you had a working printer, and you were performing an upgrade. After the upgrade, things stopped working.
Unless I missed it, the question that doesn’t seem to be addressed is: Have you tried putting the old hardware back into service to see if you can bring the printer back to its previous state?
The troubling aspect of this approach is that two components—the extruder and the nozzle—were changed, introducing more than one variable.
Rule #1 of troubleshooting:Change only one variable at a time!
At the moment, it can’t be determined where the failure occurred. By returning the machine to its original state, you can verify whether the issue lies elsewhere. If it continues to fail with the previous components, then it’s time to examine the electronics or the motor.
If the printer works correctly with the older components, change out each new component one at a time. Start with the extruder, test it, then move on to the nozzle—or vice versa. It doesn’t matter which is replaced first, as long as they are replaced one at a time.
If I well remember, it began when a filament was broken into the extruder. Apologies, forgot to mention it…
Printed PETG-CF withe hardened nozzle, after that occurs, I only changed the extruder gear but the issue began…
But you are right, even if the broken filament was removed, I will ll put old parts and will try again.
I can now better follow your diagnosis and why you suspect the extruder motor.
Indeed it is plausible that what we are hearing in the video is the extruder motor being active, but the shaft slipping in the gear.
Since you have the same issue on the old and the new extruder, I can follow your observation that it is likely to be the extruder motor, specifically, the shaft.
I would expect markings to be present on the extruder shaft and/or damage in the gear assembly in this case. Or it may be that the press fits of the gears on the extruder shafts are loose. But that would be strange if it affects both.
I think it may be best to open a ticket with support at this stage. It may be a slow and painful process, but they have the most in-depth insight on their printers as well as being able to read their log files. And seeing that you appear to be based in the EU, your machine may still be in the warranty period. That kind of defect should really not occur within the first 6 months.
As @Olias provided, I replaced and put all the old parts and the noise is still there… Result is like an under extrusion, like if settings suddenly changed and flow rate isn’t good…
Here is my new video after replaced with old parts:
I made an editing mistake, so the previous post (post deleted by author) again
May:
If you can manually extrude multiple times and it only stops the third time, it could be a drop in temperature. If the nozzle is too cold, than the drive motor needs too much power and reaches its performance limits.
Example: If you pour half a glass of cold water into half a glass of warm water, the new glass will then have the average temperature. This is what happens too when you press cold filament into a hot nozzle - The heat requirement increases and the temperature falls if there is no or too little heat power flowing in.
Did you use temperature paste between the ceramic heater and the nozzle? Air is a very good insulator - if the heat exchange between the ceramic heater and the nozzle is not guaranteed, the heat flows too slowly into the nozzle and the driver motor will need to much power to get the fillament thrue the nozzel.
Did you use temperature paste between the ceramic heater and the nozzle? Air is a very good insulator - if the heat exchange between the ceramic heater and the nozzle is not guaranteed, the heat flows too slowly into the nozzle.
Yes but it looks much better. If you have a problem in the first layer with PETG, the errors will follow. Take a print screen of your PETG settings from the slicer, but now I have to go now - I have another problem with another heater, but this one has 1.2 MW… so have a nice Sunday…
This is the diagnostic path I was hoping to channel us back to. Although we still don’t have a root cause, we can at least work from a known case with the fewest number of variables.
Given that the motor does not seem to be applying sufficient torque to the extruder gear, my thoughts are that it may be the motor or something overlooked in the extruder to drive transfer. It has been a long time since I replaced my extruder but if this were me, I would try to retrace my steps and see where I may have missed something.
This screengrab was taken directly from the bambu wiki on how to replace the extruder.
I would pay particular attention to this area hear and inspect the gears for damage. I would do a similar review of the extruder itself to see if there is matching damage. This would rule out a faulty motor and rule in a broken gear. I’m not sure if that makes any difference at this point but it is a diagnostic step that may help. For all we know, there could be debris inside the motor/gear that might be creating the noise. Who knows, maybe a well placed tweezer can “unstick” the stuck gears.
Either way, it would not be a bad thing to have a spare motor on hand but I dare to suggest that in the absence of any evidence to the contrary we have at least ruled out electronic board failure and narrowed it down to mechanical failure.
Thank you @Olias, the main thing is that it’s happen even with a brand new extruder gear and nozzle… As I mentioned at the beginning of this post, I bought these parts 3 weeks ago (before this happened) and after that, sI tested with these totally new parts…. But unfortunately same issue…
I have resend a message to the support center, I hope they will send to me a new extruder motor, but when… ticket is opened 4 days ago…
I also inspected the motor’s gear and it seems normal regarding the outside aspect…
