The last multi-color print I did was months ago (Boat Model 010 - The windup-motor boat by vandragon_de - MakerWorld) and it took forever. I normally print in one color (black or silver or whatever) until it’s gone, so this constant feeding and retracting is a time suck, and on a nearly full spool it can have catastrophic consequences (as you mentioned). I guess one way around it is to feed it in from my Sunlu drybox, but that defeats the purpose of having an AMS. This machine has such phenomenal capabilities, I just don’t use them (well, except for the motorboat) because of the time it takes and the amount of filament waste it produces.