They didn't like Tesla's ideas!!
So
Have you made a prototype?
Multicolor -- what kind of valve will accommodate 4, 5 different colors or materials (support PVA)
What type Capacitive level detector? Does it work with ABS, PLA, Nylon, Polycarb?
Most Capacitive level sensors need rod to bottom?
Might be easier to just count particles with optical interupter?
With optical sensor may be able to discern color of particles?
Will a Vibratory pump work and provide pressure to extrude material
and not clog up (inlet valve, outlet valve)
So the particles just drop into top of pump with gravity?
How do you isolate cold feeder from hot melt pump 25 deg C vs 260 deg C
Thermal isolation ALWAYS a problem.
I say --- build a prototype work out the bugs -- manufacture them sell them
pay enormous taxes --- get bought by a big firm --- yes!