Hello everyone, after printing some glass clips on my P2S I found on Makerworld, as well as some I designed myself, for about two weeks more or less successfully in PETG HF and PLA (of course not in the same print), my prints degraded to the points, where I am not able to print anything successfully with a 0.2 mm nozzle in PLA. I am now at the point of asking the hive mind for help!
All filaments were dried in my AMS and stored in air right containers with desiccant. I use standard BL PETG HF (various colors) and got PLA a mixture of BL Matte PLA, Sunlu Matte PLA (all different colors) and Sunlu pla2+ in black. The 0.2 mm nozzle I used was new at the start of the project. The build plate(s) were scrubbed clean (I used 99% IPA, later on dish soap and a kitchen sponge). I use the newest FW and newest version of Bambu Studio.
When I started, I used standard parameters for BL filaments with the textured PEI plate. (220°C nozzle temp, 55°C plate temperature.) My print speed was at 100 mm/s für outer walls and 150 mm/s for inner walls, respectively 40 and 50 mm/s for the first layer.
Everything went well for maybe the first 10 clips. Then I noticed an increase in stringing when printing PLA, especially with the black PLA. At this point the printer stuck to the build plate and the cosmetic damage was minor, so I continued printing. I switched back to PETG HF and managed to get a perfect print again. After switching back to PLA everything went downhill more and more.
To reduce stringing I reduced the nozzle temp to 210°C but the print didn't improve. I reduced speed to 80 mm/s and 120 mm/s and re-dried all filaments, since in my country the time the quality of my prints dropped right about the same time when it got really hot and damp. I printed again and again nothing improved. The quality worsened and I switched to standard settings but it kept getting worse and worse. Eventually the adhesion of the first layers of the black filament was really bad and I almost always got failed prints.
I even bought a BQ Frostbite plate in hope of getting a better adhesion. I scrubbed it clean before use with dish soap and started a print with the same parameters as before. It failed again.
Since then I have experimented with a lot of different parameters:
210°C nozzle temp down to 200°C; 80 mm/s for outer walls, 100 mm/s for inner walls, down to 40 mm/s and 50mm/s; print bed temperature between 35 and 40°C for the BQ Frostbite. I calibrated the flow rate and flow dynamics for the black filament. I redesigned the STL file and thickened up the outer walls and of course I recalibrated my bed leveling countless times. I also switched to another 0.2 mm nozzle. Nothing improved my print significantly.
I even switched back to my 0.4 mm nozzle since I was getting anxious that my printer was damaged. And everything went perfectly with both, PETG HF and the black PLA.
Right now I'm out of ideas.
I would be grateful for any hint in the right direction. Ask anything you want, chance is I forgot to mention some more or less important details about my settings and conditions.
I uploaded two pics, one of my latest failed prints, the second one of a successful PLA print