Hey folks, just wanted to give you an update on this issue. I gave the plate a real deep clean this time—steaming hot water and Dawn dish soap. And guess what? It worked! I managed to get a solid print with no issues. I printed a 250mm x 250mm x 0.3mm square using my 0.6mm hardened steel nozzle, and it came out immaculate (except for some ambient cat hair that was attracted to the black plastic).
Interestingly, I didn’t use Bambu Lab PLA Basic for this print. Instead, I went with Bambu Lab PETG HF, and it still stuck down perfectly.
One thing I noticed, though, is that the PETG HF seems to have the same bed preset temperature (70°C) as the other plate presets.
Could it be a temperature issue rather than a filament one? Seems strange, considering Bambu says the plate holds PLA at 45°C just fine.
I’m incredibly curious now, so I’m going to run the same print again but with same Bambu Lab PLA Basic and set the bed to 65°C (like the other PLA presets) to see if that makes a difference.