Yes, Bambu needs quite long to resolve tickets. I had a particularly bad case overlapping with the A1 launch and recall and last years X-mass sale.
Since this was done as part of troubleshooting, you may get lucky and have a spare sent from Bambu. It certainly does not hurt to ask. That kind of repair could also result in wrong temperature readings and hence cooler than anticipated printing, explaining the benchies. But it gets confusing as to what was done when and led to which result. Similar with the PETG print. So troubleshooting is pretty tricky.
So I think it may be helpful to follow @Olias advice and capture the current state by looking at the extruder in detail, taking a lot of detailed pictures and differentiating between both units.
Then also for the hot end. Although you’ll want to chuck and replace part of the one with the broken cable, depending on which cable was torn.
This just happened today and after I soldered it and tried again, same results. So, it’s not due to that…
I will wait for the new extruder motor and will take pictures of it. But there is something that I really don’t understand: why it would be an extruder issue despite I installed a totally new one, and same for the nozzle? As I have this issue with totally new hotend and new extruder/ extruder gear, shouldn’t be an extruder issue? As you suggested earlier in this thread…
That is what had me puzzled initially. And I admit that initially, I focussed too much on the Benchies which looked like resulting from a partial clog/thermistor error.
However, if the initial failure caused a slippage on the motor shaft, there would likely be permanent damage, making it likely to re-occur with a newly installed extruder gear.
But that is just speculation on my part from an elimination of other failure cases that I have seen and your descriptions. Essentially, you may have two unexplained issues:
The initial failure (which may well be a combination of a nozzle clog and an unfortunate extruder installation).
Follow-up damage from the initial failure.
That is where things get deep and detailed pictures of the extruder assemblies and motor shaft, etc would be needed.
That is also why I suggested to work in particular with Bambu’s support. They not only designed the machine, but they have a library of standard and exotic failure cases by now. While they are not quick (they’ll need to rule out all of the “standard” failure cases first ), they’ll be better able to diagnose. The frustrating part is getting across that first hurdle.
Oh, and they’ll probably need to get good pictures of the motor shaft etc. as well, so feel free to post once you had a chance to take them.
Where is the spring. There should be a spring in the pile of parts.
I have made note of location of tensioning screw and spring
Picture from wiki is older but transpancy is good in this case. You then crank down on screw head to set tension against fixed extruder gear
Also, if you have not head from tech support, right off the bat they are going to want you to unplug every one of the cables, front and back and may even request pictures of the cable/socket connection.
Those cable connections are a major pain and it can be tedious to plug them in correctly
How tight is the screw that pushes against the floating extruder gear
Tech support told me to turn screw until it was bottomed out. Which is were it is today.
You probably won’t be enthusiastic about my suggestion which is tear down the toolhead COMPLETELY and put it back together.
That is high on the list of things tech support will likely have you do. I have enough parts to build one and probably two toolheads based on how many parts tech support sent for me to swap out during my toolhead woes.
You are good based on picture you posted.
As a side note, that ribbon cable on the right side is beyond delicate. It has compound bends to get it from filament detector to board.
I will tear down the toolhead COMPLETELY and put it back together after I received the extruder motor from the Support. As I already broke the nozzle sensor cable, I don’t want to broke another one, these cables are a pain…
When you tear it back down take a good look at the pins on all the connectors. Also if you have a camera/phone with a good macro setting take pictures of the connectors on the toolhead board too. It’s really easy for those pins to get bent and then make intermittent contact.
The failure began with a broken filament into the extruder. It was PETG-CF, only after few minutes of printing. Of course, I already changed the nozzle with an hardened steel one but not the extruder gear…
The issue began after I cleaned and replaced everything into the extruder, when the filament broke… since, nothing is working anymore…
As someone who has had a fair amount of tech support interaction, I want to caution you that you are probably in for a fair amount of troubleshooting via email back and forth between yourself and Bambu Lab tech support. See the highlighted part of this picture.
My tech support spanned around 5 weeks and they sent me a new printer, they never did fix the original printer.
I wanted to read it quickly because I can still learn something sometimes.
You are my personal hero by living my dream If those are pills tell me which ones, I’ll order a whole truckload of.
Seriously, keep your superpower - it’s rare that anyone impresses me, but you’ve definitely done that now. I would probably have blown up the printer 3 times and gotten a new one
), they’ll be better able to diagnose. The frustrating part is getting across that first hurdle.
If those are pills tell me which ones, I’ll order a whole truckload of.