so they were melted and extruded on the fly ?
That's very neat.

At the moment - filament is cheap enough and the only small volume pellet supplies I've seen have actually cost more per kg than filament.
The mixed colour thing could be interesting. But there was an article last week about some dual colour 3mm filament and the results did look pretty awful.

I just don't see any point in home printing with pellets at the moment.