I don’t have a Bambu but what they also need to look at is retraction settings after purging the extra filament.
Seems like it needs to retract a little more to lower the “pressure” of the melted filament in the nozzle.
Best analogy is that this is like a giant glue gun. Squeeze really hard and fast and the glue isn’t going to stop when you let up in the trigger. Except, with a printer, you can have the extruder “retract” a little which does introduce a vacuum effect and slow/stop the oozing.
Note: make small adjustments with a direct drive (which most of these printers are using these days) so you don’t pull molten plastic into the heatbreak and have to deal with clogs. However, if it’s oozing out you’re probably not even close to that being an issue.
I use Klipper and OrcaSlicer but when I get a new type of Filament (ABS, PLA, TPU) I tune it including retractions. This way it does cleaner lines and is less likely to leave blogs, stringing. And tuning filament retractions here (or something specific to purges) should fix the issue.
Me ordering the ribeye.
Wait… wait… [chewing] he’s got a point