IsnĀ“t it dangerous to switch the extruder relais while the driver chip is powered?
I've seen on my two color printer, that long retractions (to change color) can tangle the filament on the spools.
IMHO there should be an active filament feed which rotates backwards to tighten the filament.
What I would really like to see is a multicolor print where several colors appear in one layer.
I wonder if simplify3D have found a way to slice it in a printable way.
-Olaf