A few things I might consider/think to try:
- How old is the PLA you’re using? Is it possible it’s absorbed too much moisture?
- Are you printing too fast or possibly under-extruding?
- Skip the glue. I’ve found it’s just gunk that separates the filament from the print bed, worsening adhesion in my testing. Clean your print bed with rubbing alcohol before hand.
- How old is your nozzle? If you’ve been printing for a few hundreds of hours, the inner diameter of the nozzle might be worn out.
- How hot is your print bed? For PLA, I’ll usually keep mine around 60°C.
I don’t have a Bambu, but these are a few of the things I’ve learned with my Monoprice Maker Select v2 and Ankermake M5.








What sort of scale are we looking at here? To me, the raised perimeter and hole in the center looked like an old chevy tie rod end, but it would have to be in a severe state of decay.