I just got my sunlu pla matte filament and I am unsure how to properly tune it.
On the spool it says that the recommended temp is
205-215C for 50-100mm/s
215-245C for 100-300mm/s
bed temp 50-60.
When I first tried printing with bambu’s default matte PLA settings and it was fine but I wanted to see if I can get better results by tuning it.
For reference, bambu matte PLA’s default settings are 65C bed, 220C nozzle temp.
I first sliced my project and under the speed preview, I saw that the highest printing speed goes up to 450mm/s. Since bambu/orca slicer does not allow me to set nozzle temps for different print speeds, I adapted sunlus recommendation, bed to 55C, initial layer nozzle temp stays at 220, and other layers at 245C. I also max out the fans to 100% as suggested by sunlu (this setting turns out to not be crucial for me by A/B testing it).
Did auto flow dynamics calibration and started the same print again and the results were horrible. Lots of random scratches and uneven layer lines even from the first layer.
Is my calibration process wrong? I am guessing the biggest reason for failure is the nozzle temp but I don’t understand why printing at 220C (default bambu) gets better results than 245C (recommended for 300mm/s) when my printing speed (450mm/s) surpasses that. Could it be because only my sparse infill speed hits 450mm/s while other parts of the model print slower, thus I cant use 245C? If that’s the case which speed should I calibrate for because the printer is not printing at a constant speed?
I’ve read that flow rate/dynamics are affected by nozzle temp (which is correlated to print speed). So in other words, flow rate/dynamics are also affected by print speed. If I have a print with varying print speeds for different layers, how would I manually calibrate the flow? If I calibrate it for 450mm/s, it might be bad for other layers etc. There are so many different factors that are correlated and it confuses me on the exact procedure and sequence to correctly calibrate the filaments. I have read posts on how to do it but none are ever this detailed and couldn’t explain my situation/questions.
My current best guess for the calibration process is this. Since outer walls are most important (I’m guessing), I should look up Sunlu’s nozzle temp recommendation for my outer wall speed. Use that nozzle temp to perform orca calibration (using the profile I will print my project from so it has the same speed parameters). Does this workflow sound reasonable?
