Rookie question. I have been printing with one extruder for 7 months and would like to upgrade to dual extruders. My question is very basic. If I create a part, let's say a whiffle ball to be printed white and in side I want a red cube, How do I tell the M2 to do this? I'm using AutoCAD Fusion 360 a...

Has anyone tried ColorFabb copperFill Metal Filament? I'm interested in trying this in my M2.