Kris,
which filament are you trying to print here?
Some observations reading though this topic:
- Your print bed is really dirty. This creates these ‘holes’. NEVER print on a dirty PEI bed, even touching the bed with fingers is already leaving oils which prevent some filaments to stick to the bed at all.
- You mentioned that you changed your nozzle. If you do that you most probably set an Z-offset for prints because the new nozzle is seldom exactly in the same distance with the sensor. I had same, and had to add 0.015mm at beginning with new nozzle. Now after printing again for ~200h with new nozzle the required Z-offset was already reduced to 0.005mm.
- You do not need to run full calibration (PA and flow rate), just the bed leveling and define a profile for you filament like described here
- If you need different Z-Offsets for different print beds or filaments you may use a macro like described here.
- Check your extruder if it is wobbling or has loose screws.
- Check your build plate, especially the part in the middle at the back which is used by the printer to test the nozzle touching to print bed and cleaning the nozzle and calculation required offset to distance sensor. If you bended this part down the the printer will use a wrong nozzle distance and you prints are not correct anymore!
Luckily all problems I had I could be resolve with above checks/corrections and my print head had never scratched (or even touched) the bed.
I even have not used glue sticks or so even printing 300mm long ABS/ASA parts.