Great! I don't think the AMS is a necessity like in general, specially for pieces that only need to have a functional purpose rather than a colorful look.
Problem is A1 has only one nozzle. Printing by pieces makes it possible to achieve even better looking results because the colors won't look merged in the final piece, (specially when changing from black to another color). Also the amount of dumped filament is insane! I won't buy an AMS, I rather get a multi-nozzle printer if I manage to make the business grow.
Good luck on yours!!