The fundamental problem with multi-color 3D printing using a single hotend is that they poop an awful lot. Every time they change filaments, they’ve got to purge the single nozzle, which results ...

There is a lot of waste that comes because of this process - Purged Filament or "Printer Poop". The A1 is a "Bed Slinger" and is an Entry Level 3D Printer. The X1-Carbon is an improved 3D printer.