Filament sensor failure/Calibration problems
After assembly, calibration, and several successful prints my recently received i3mk3 wasn't printing well. I went to do a re-calibration using the wizard which failed when it could not detect the filament sensor.
I double checked the wiring and nothing is loose but I reseated the cables anyway. In the control panel it still could not see the sensor. I disconnected the sensor and tried to rerun the calibration but it failed again when it couldn't see the sensor.
Upgraded firmware to 3.1.3-245 to see if it would allow me to run the wizard without the sensor connected. After the upgrade went to run the calibration wizard. It get's through the X and Y but then it moved to the left front (home) and started scratching back and forth with the extruder hard against the surface. I cancelled. Tried calibration again with the same results. This was not the gentle lowering of the head while moving back and forth but a fully lowered moving back and forth touching the service.
I did a full factory reset. Re-ran the wizard and same behavior. Please advise.
I'm technical but this is my first 3d printer. Let me know if you need any voltage or continuity measurements to debug.
Re: Filament sensor failure/Calibration problems
I am seeing the same issue with 3.1.3. I made some changes to my printer including the bed and xyz calibration goes wacky, rams the nozzle down into the bed and starts moving back and forth. Done it twice, second time I was a bit slow on the power off and it scraped through the paint and shows copper on a brand new bed. These beds cost around £90 so not very amused. Something screwy with the last couple of firmware releases in all sorts of ways. Maybe we need Josef to get involved in the firmware again to iron out these failures. A new build with a brand new bed should not be damaging itself while calibrating!
Re: Filament sensor failure/Calibration problems
If the nozzle scratches in the bed during calibration, the PINDA sensor is too high.
Adjust the PINDA height and then make a "First layer calibration" again.
Bear MK3 with Bondtech extruder
Re: Filament sensor failure/Calibration problems
I set the PINDA sensor height per the build instructions using a zip tie as a spacer. I rechecked it last night and it is still set one zip tie width off the bed when the head is gently touching the bed.
This problem didn't happen until the firmware upgrade. I will try rolling back to older firmware to see if that fixes it. Any advice on what to do about the filament sensor failure?
Re: Filament sensor failure/Calibration problems
If all of these issues occurred after the upgrade, there might be a problem during the flash.
Do not downgrade, make a reset and update the latest firmware again so maybe the problems will disappear.
Bear MK3 with Bondtech extruder
Re: Filament sensor failure/Calibration problems
I had a similar issue, after updating the firmware the nozzle scratched up my heatbed. I reflashed and it worked the second time.I was across the room when it happened (didn't expect issues since my calibration worked the first time). Before I could get to the button, it started moving back and forth just to make sure it scratched it up real good.
As an aside, is there anything I can cover the scratches with to protect them from oxidation? Support didn't have any suggestions.
Re: Filament sensor failure/Calibration problems
Borrow a little nail polish and paint over the scratches.
Bear MK3 with Bondtech extruder
Re: Filament sensor failure/Calibration problems
Borrow a little nail polish and paint over the scratches.
Thanks, I asked support specifically about that because I had heard something similar and he said he didn't think it would stand up to the heat. Any particular type of nail polish that would mitigate that? (I'm not a nail polish aficionado unfortunately 😀 )
Re: Filament sensor failure/Calibration problems
I re-downloaded and updated the firmware. I put 5 sheets of paper under the nozzle and ran calibration wizard. After checking the X and Y it once again moved to the front left corner and dove so hard that it almost punctured the paper and just wiggled slightly back and forth with the head hard down. Hit cancel again.
The PINDA sensor led is lit while going down and goes out *before* it hits the paper on the heat plate. It is setup and adjusted according to the build instructions.
I'm starting to wonder if I have a defective controller since this behavior and the filament sensor failure happened at the same time.
Re: Filament sensor failure/Calibration problems
Anyone know how I can get help with this?
Re: Filament sensor failure/Calibration problems
Borrow a little nail polish and paint over the scratches.
That's a bad idea, from personal experience. Nail polish becomes a little sticky when heated, so the flexible steel sheet will be difficult to remove. Additionally, you'll get nail polish on the PEI sheet.
Annoyed by the nail polish, I went and bought some high temperature lacquer (600 Celsius degrees it said on the can, it must be good I said). Same thing, it got sticky as well.
Final solution: kapton tape, worked like a charm.
Re: Filament sensor failure/Calibration problems
Anyone know how I can get help with this?
If I understand you correctly, you have done a successful XYZ calibration (which takes about 12 minutes to complete).
Is it after that calibration that the nozzle pops into the bed (before you have laid back the steel sheet on the heating bed)?
Or are you talking about something else?
Bear MK3 with Bondtech extruder
Re: Filament sensor failure/Calibration problems
With the metal sheet off, doing x,y,z callibration. The X and Y complete and then it moves to the front left corner and tries to dig into the bed.
I also need help on how to get an RMA for the filament sensor.
Re: Filament sensor failure/Calibration problems
With the metal sheet off, doing x,y,z callibration. The X and Y complete and then it moves to the front left corner and tries to dig into the bed.
I also need help on how to get an RMA for the filament sensor.
OK, you should check the height of the PINDA sensor again. Loosen the screw slightly and turn down the sensor for half a turn (clockwise). Then redo the calibration.
If the sensor is too high, the printer thinks the nozzle is higher up and therefore wants to lower it more than is possible.
Prusa's video describes this. https://shop.prusa3d.com/forum/original-prusa-i3-mk3-f30/the-most-important-links-original-prusa-i3-mk3-t13545.html
For RMA, contact Prusas chat on this page (bottom right)
https://shop.prusa3d.com/en/
Bear MK3 with Bondtech extruder
Re: Filament sensor failure/Calibration problems
Lowered pinda sensor. Same behavior. Even with four sheets of paper it is starting to gouge my heated bed.
Re: Filament sensor failure/Calibration problems
Did you find out what the problem was, as I’m having the same problem as this? 🙁