I dont know if my dry box is too dry but I’m often seeing filament that is ~1.6 instead of 1.75. Is there a way to adjust the filament diameter in luban? I saw a closed feature request for it but I dont see it in the UI.
No, Luban does not give this option. The difference in filament diameter you are seeing is normal (mainly with low-quality filaments), and is why tuning the flow settings for each filament is a must for proper calibration of the machine. I suggest going through the TeachingTech or Ellis3DP tuning guides.