[fennecfoxy]

It's wasteful in part due to Bambu's defaults for purging; they're really high, I imagine to make it "foolproof" but it means I see people (like the YTbers who made a stop motion film with 3d printed objects) waste a loooot of filament, because they have no idea it can be dropped quite a lot before colours start mixing.

It would be lovely for the BL printers/AMS to use a colour sensor at the hotend and then you can run a calibration on purges to determine what is an acceptable threshold when transitioning colours and use the absolute minimum purge amount.

[the_af]

I suppose more complexity (like the sensor you propose) would increase the chance of failures or something going unexpectedly. Bambu Labs seems to be going for "It Just Works", at the cost of being wasteful. Seems to be working as a strategy, giving the rave reviews it's getting...

I'm not using my AMS much, precisely because I simply cannot stand the waste and the additional print time.