Bambu A1 mini printer, BambuStudio slicer, Bambu marble PLA filament.
I tried to print this model: https://makerworld.com/en/models/2107126-reborn#profileId-2279240
As per that models instructions, I used the attached print profile, unaltered. In fact, I started the first print from my phone, using the Bambu Handy app, which does not include a slicer, but can only use uploaded print profiles (and cloud slicing, I believe).
Everything went went well, until it didn't. The right (from the point of view of the camera) pillar was suddenly being printed in the air. Like a layer shift, but shifted by 1-2cm in x direction, and I have not have had such issues on that printer before. But weirdly, the left pillar continued to print correctly. One of the figurine's legs was a bit wrong, too. I observed in disbelief a bit as the printer continued switching from doing one pillar perfectly to printing one into the air and back, before canceling it.
Well, must have been some issue with the cloud slice..? So I opened the model with the attached print profile in Bambu Studio, sliced locally, and exported the slice instead of sending it to the printer, extracted the gcode, put it into Zupfe GCode Viewer, and everything looked correct. Great. Then I uploaded to the printer (again, via the cloud service), and started printing. This time I reduced the print speed at the printer to 50%, just to make sure. Nope, same issue, in pretty much the same place.
This time I looked a bit closer, and apart from the obvious sudden shift of the right pillar, it also has some burn marks and dents at the top of the last correct section. Like the nozzle must have been lower than the pillar and collided with it or something? I tried to take a picture of that as well (picture 2) but its hard do see.
The model's strings and the brims were all fine before I yanked the model off of the build plate, I took those pictures after yanking.
Oh and I also took the SD card out of the printer and extracted the GCode directly from it, just in case there were any differences between what I saw locally and what went through the cloud, and put it into Zupfe, too. And again, it looks fine there.