Hi Everyone,
Hi I have the p1s and recently i get a
-“printing stopped because auto bed leveling failed” -“an External disturbance was detected on force sensor 1. the head bed plate may have touched it…”
This only happens when i try to print PETG (not hf as i bought these rolls from bambu long ago). I have printed PETG before and it’s been fine. If i print in PLA = no issues.
IF i un-check auto-bed-level box… it will print PETG.
I have tried the following:
clean Debris on all the axis
re-calibrated
tried different rolls of PETG
updated firmware
moved the wire in the rear to make sure it’s not touching.
Any suggestions? Thanks
I want to say the weird thing is when it auto-levels for PLA = no issues, only petg… I did observe it and didn’t see anything i can tell that is obstructing the movement (but i also don’t know what i am looking for).
I checked under and didn’t see an debris… i did vacumm the printer clean (maybe i’ll check again and hit with a air compressor).
Yes, it doesn’t make sense. PLA and PETG are different plastic but melting points are very similar and from the point of view of the printer, they are pretty much the same.
It’s like your car only ran on ron91 but not ron95.
I can only make wild guesses. Like, your plate somehow became solft with PETG but hard with PLA or a phantom object got in the way of the nozzle when it do the tapping.
We need more info, as much as possible,like, something small and obvious to us but might not to you and vice versa.
I think record videos is the best way, for both cases: normal tapping when doing PLA printing and fail tapping when doing PETG printing.
Read this thread for more info about the auto leveling process Bed Leveling Process
On another guess, it could be the connector of the piezo sensors is coming lose a bit just enough for it not to register the signal from a tap. This guy https://www.youtube.com/watch?v=Fb3LNc1WQnA had that problem and fixed it by taping the sensor wires to the poop chute.
My X1 has had issues recently finishing a bed check in the back corner, it repeatedly checks one or two spots like it can’t get a good reading and I suspect it could be the piezo bed sensors starting to fail? It mainly happens when my chamber is heated >45c, I haven’t noticed it when its cooler.
I trammed the bed a few times to ensure it wasn’t out.
Hi Simon, I did see the guy’s video on the cables and i did his little instructions to tape it and see if the wires getting caught but didn’t help me thanks!
Videos below are taken within 10 minutes of each other.
You have grinding noise on bed motion which suggests there is a problem with the belt that links 3 lead screws of z axis, at the under belly of the printer. I think the problem is around the pully at cable tensioner.
1:39 PETG video, there is different noise sound like skipping step of the Z motor. Try to move the belt by hand if the bed can move freely.
I had this grinding noise problem before and the solution was lubing the bearing of the pully that apply tension to the belt, using silicone spray.
Note do not lube the belt as slipery belt can cause step skipping.
