I’m about to install my third nozzle offset sensor. I don’t know what on earth is going on with this printer. Support keep telling me it looks okay, and I am losing my will to live with it. It spends more time sat there than actually in use. Every time I manage to fix it or get a print going, the next one after that fails, and I can’t move forward. Any ideas what I can do, what the problem might be? I’m pretty sure the printer is damaging the sensors. If you look at the latest photos, the part on the right, which I’m not sure what that is, is that the sensor? Is basically damaged. Then what I assumed is the sensor, which is the small square bit, is now all clouded over. Not sure what’s happened to it?
Just getting a bit fed up. I keep putting new sensors in it to make it work for a week or two, and then it dies again…
I’ve tightened the nozzles, I’ve changed nozzles out, I’ve triple-checked everything, and it just keeps happening.
So I’ve been digging through all the wikis about this sensor, and then I came across a crucial part:
During XY offset calibration, the nozzle may abnormally contact and damage the sensor due to incorrect height (e.g., nozzle sticking filament during Z offset calibration).
Now you should check whether that’s the case for you and whether the problem isn’t actually the sensor, but rather, for example, a nozzle wiping or cleaning issue.
The underlying problem may actually run even deeper - for example, if the nozzles or their mounts are loose, or if the screws aren’t tightened securely enough.
Second advice from a user comment I found below, you might want to check that out, too:
For my issue, the pins going into the plastic connector had worked their way out. This caused the bad connection. New connector cables have a dab of silicone holding the wires/metal pins in the plastic connector. So check your connector on either end of the cable and you may save yourself some time. You could use electronics silicone to seal the ends and prevent this in the future if you don’t want to go through the trouble of replacing the connector cable entirely.
I had this issue on my first H2C pretty much right out of the box; it spent a week or two troubleshooting and ultimately got the whole machine replaced.
In my case, the nozzle ripped the whole side off the sensor and carved a gouge in the build plate.
Someone else on here was having this issue a few months ago, I don’t know what their resolution was, but I don’t recall seeing a definitive fix.
Yes, you are responsible for any damage that happens to the machine during transit - so you’ll need to box it up and do it well. If you don’t have the packing materials they can ship on out to you - that may come at a cost, hut I’m not sure. Bambu also has videos and a wiki guide on how to pack it back up.
Ordinarily, you would have to wait for them to get it, test it, etc., before sending a replacement but there is an option for “advance replacement” - you pay for a new machine, they send it to you as soon as you send proof of shipment (picture of the box and of the shipping details), then they refund you once they get the machine and inspect it.
The “inspect the machine before doing stuff” stages in either case can be frustratingly slow, I had to get a little bit persuasive to speed up the inspection and refund process in my case.
My advice is to work with the support team in good faith, give them everything they’re asking for promptly, but if they start going in circles, you should ask them for their entire troubleshooting tree for this error and start pushing back a bit - it isn’t reasonable to just keep doing the same thing over and over and expecting a different result.
Please report back on your progress, if you’re not getting anywhere we can try to get some extra attention on your case.
It could also be a malfunctioning Eddy Current sensor in the tool head.
I don’t mean fully malfunctioning, but more in the sense of that it needs more pressure to do the Z-probing.
On the bed that might not be an issue, but on a delicate sensor surface, it does.
It’s almost for sure there is something wrong with the machine, not with the sensor.
A whole replacement might be the best issue, unless you are willing to keep on replacing more and more components until you find the root cause of this issue.
One of the last steps would probably be the main board or a total tool head with X-rail.
