Have a strange one that I can’t seem to work out.
Week old P1S will randomly have a poor print, but the very next print will be perfect.
The issues are extreme ringing, oval circles, and under extrusions.
Send print to printer via Bambu or Orca - both have had the same issue.
Poor print with the listed issues.
Remove print and reprint via sd card.
Perfect print
I can go quite a few prints between issues, which makes it incredibly hard to find it. I believe it’s an issue with the machine as the same gcode without any changes has different outcomes.
On a different fourm, it has been suggested that it looks like the ‘input shaper’ has failed and on the reprint it has been ok.
This would also line up with an earlier issue i had with xy belt tension codes and having the codes repeat a number of times. Little odd for a machine at the time only having 19 hours.
If anyone has any insight, please let me know.
Thank you.
On the left is the original print and on the right is the reprint. Only difference between the two is the lerf was started from the slicer and on the right from the sd card.
Second was 30min after the first had finished.
Same filament.
Same AMS slot.
Approximately same chamber temperature.
My first association from the ringing is, that vibration compensation might go wrong somehow. Is there any chance, that the surface that the printer stands on hasn’t always the same rigidity?
Generally, BambuLab recommends to do a factory reset after a firmware update. Some weird effects have been solved that way for others.
The pictures showing the top surfaces look like really fundamental flow problems. After my first thought “is the filament ok”, I would again try a factory reset first.
Logically if it was an external issue both prints would show the issue, printing from slicer vs sd card wouldn’t fix an external issue?
The above photos are the exact same gcode, filament, printer location. The printer wasn’t reset or powered off between prints. Prat was removed and then reprinted from the sd card.
But just to confirm the printer is on a very strong and heavy workbench and the issue has happened on multiple filaments.
A factory reset has been completed a few days ago.
@Hurla seemed to have a similar issue where a reprint from an sd card showed no issues of the frist print. Unfortunately no solution was given.
In the other thread it seems like most people didn’t get the point that this happens occasionally.
And I missed in your first post, that you already mentioned input shaping.
I agree that this looks like a fault in the machine and not like something that could be easily identified and corrected by the user.
I think your best bet is opening a ticket with support. You have taken excellent pictures to illustrate the issue. I would pick only two for the ticket. E.g. the first one and the one before the last where one can see the top surfaces.
When you write as concise as you did here, my experience was very positive with support. I hope that issue is known and they find a solution for you.
The only thing I can think of, with the scenario you describe, is that once in a while the printer isn’t receiving the g-code fast enough from the SD card.
I have seen my P1P “pause” for a second or two when it was new and running with the stock SD card.
Once I replaced the card with a name brand car I have never had that issue again.
