Here is my first report - before the arrival of cleaning utensils:
- moved to a cooler room, with a more stable surface
- factory reset on the printer after the firmware update
- deleted the local preset files on my computer
- re-installed Bambu Studio, denying the restoration of presets from the cloud
- flipped the PEI plate.
(Before that I had cleaned the nozzle while stationary and at 250° to get the residue plastic off the tip and did a cold-push tip cleaning. But extrusion seemed smooth before, that did not seem to be the issue)
Unfortunately I did all at the same time, so I don’t know which one did what.
BUT so far the first 142 layers have gone down perfectly again.