Nozzle purge for color effect

if i understand way of,
filament enter in nozzle chamber,
in his filament hotter
for getting ready for nozzle needs.
but, if we knew needs for good color mix by for
exemple:
Bambulab pla basic,
and we can have as way of
double ptfe enter in top of nozzle for attach
2 enter of nozzle,
right and left on just left

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