Sometimes people post wondering why their prints come out horribly.

They will adjust their settings and tune them to a specific brand, color, and type of filament. Then, after a little while, they change something minor, like a different color from the same brand and their prints get all messed up. It takes different additives to make different colors. In the 3d printing world, yellow is different than red, which is different than blue. The different additives from the colors cause the filaments to behave differently when melted, which in turn results in different looking 3d prints. You must tune them each individually.