Here’s what I’ve been thinking about multi-extrusion:
I think the easiest and most failsafe method would be to have multiple nozzles arranged in the same heatblock.
That way, one does not need multiple heating outputs from his main board and there is a significantly reduced purge tower. There also wouldn’t be any chance of jamming in the filament path.
In terms of multiple materials, I think if coupled with a good heater, this should manage to do filaments ~15C apart.
What do you guys think?