@Pete - That’s one of the reasons I chose Cel!
@Pelgrim: Maybe Cel can make a head that injects liquid color pigment just before printing… Or while printing, instant coloring. Based on 4 or 5 cartridges (like reqular printers). Someone or a company (I can’t remember who), already experimented with adding color pigment while creating their own filament with a studer/grinder. Who knows, maybe in a couple of years…