why there is an purge line for wat is it
For any current Bambu printer, the purge line closest to the front of the build plate is used to create a smooth and even flow of filament, ensuring the nozzle reaches the correct pressure. However, there is another purge line that serves the same purpose but is performed right after flow calibration. This is the same reason we use purge towers in multi-color prints: the nozzle needs to maintain the correct pressure.
its good if you want good prints.