Toolhead is slamming the wall above the poop chute. It’ll then purge some filament and then move to the front before slamming into the same spot above the poop chute and purging again. This process repeats for around a minute and a half. Then the build plate moves up and as the nozzle travels, it will scrape the build plate.
The printer selection is correct in the slicer.
I’ve used multiple different stl files and filament.
I’ve done a factory reset and calibration.
The machine has been working without issue for 3 months. The issue started last night.
I’ve reached out to BL Support, but I’m hoping the community can give me some insight to why this is happening.
What type of fault are you getting?
I had a problem and that was one of the signatures of the problem. I also plowed a diagonal line across both sides of what was a new but non-Bambu Lab build plate. It was no slouch of a groove either. It was deep. The groove was a geometric line combination of the X/Y traverse from front right corner to purge chute. Lines were a perfect mirror of each other. So don’t flip the plate over.
There aren’t any error messages.
Every time the toolhead moves to the poop chute, it slams into the wall. Even just unloading filament manually on the machine.
Be sure it isn’t just slamming that lever in the back of the chute. There is a flapper in the chute that the toolhead can hit pretty hard on occasion. Normally that flapper just hangs open but when it is purging filament it pushes against that lever so the purged filament curls up into a ball instead of having a really long string of filament
Have you run it through the auto-calibration? Any time I other than removing build plate to clean and replace I send it through an auto-cal
I pulled back cover off to look at options for putting in some LED strip to better see, put cover back–> auto-cal
These machines do have some fle to them even though it may be imperceptible to human eye. Cheap insurance to make sure the printer X, Y, Z zero and span are correct going into a print.
I am having what sounds like the same issue. I have reset the printer, updated the firmware to the latest version, downloaded back down, reset again, run through the calibration sequence, and updated the firmware to the second to last update; the problem still persists. This happens when I send a file from the handy app, Bambu Studio, or Orcaslicer. The only time it does not do it is if I put the file on a SD card and run it. I have tried every scenario that I could personally think of, only running from the SD card does it work fine. Here is a video of the issue.
On the P series printers, all prints run from the SD card. If you send a print from Studio, cancel it and then restart the print from the Printer display does it do the same thing?
Ok, I even inserted a new SD card and sent the print from my PC, stopped it, then went into the cache where the file was and printed it from there, still doing the same thing.
I think it’s just hitting the little plastic tab above the poop shoot that lifts this piece of plastic up to help the purged filament go down the chute.
I posted the complete video in another thread where someone was having similar issues, but I’ll post it here also. I’ll also post a link to the model I sent to the printer and the only thing I changed was scaled it down by 50%.If anyone wants to give it a shot to see if they get the same results.
Hi, it seems as there is a problem to get limits sometimes wrong. May be that limit switches not always respond or not respond correctly. At the moment I don’t know if there are mechanical or optical switches, or he get the position over interpretation of stepper current increase at collision. Suppose the software is basically correct, remains mechanical reason. Loose attachment, oxidized contacts (switch or connector) or dirty in optical gap. For the case they use stepper current increase detection, there may be to soft ‘crash’ in the limit (to slow increase in sensing current for acceptable pulse recognition). This is only theory, hope you would find what is real. Good luck.
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