That sure looks like moisture.
May indeed be time to change rolls.
This was said before. Glue. Glue and more glue.
I cut my teeth in 3D printing on an Ender 3 Pro, on which I had to tram the bed (paper method), probe the bed with a CR Touch, set the x, y and z offsets, carry out PID and extrusion E steps, and finally, I used a first-layer print called Perfect First Layer from cults. As it started to print, I opened the LCD and clicked on Tune, then Z axis. Perfect First Layer consists of five 25mm squares, so as the first square was printing I lowered the z axis by one click, then again for the second square, and the rest of them. This is a visual test in which I could see the quality of the prints as they were being printed. Stop when nozzle drag marks appear in the print, and back it of by two clicks. Perfect First Layer
Since I stopped using the Ender, and swapped to a BL X1C, I have not needed to carry out these tests.
I just had another thought. Just recently I bought a new 0.2 nozzle, a three pack of thermistors and heaters and two fans. I assembled two brand new complete hot ends - nozzle with heat sinks, thermistors, heaters, and fans. In doing so I had to apply thermal paste to the heater pad and thermistor. If that’s done poorly, perhaps it delivers poor results.
Perhaps a change of hot end? They aren’t expensive
I agree. All the defaults for PLA in Bambu Studio are usually around 55. I raise mine to 60 or 65 for bed adhesion.
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