I printed it using Ultimachine's Silver PLA. 3mm found at http://ultimachine.com/content/pla-3mm-silver-1lbhttp://ultimachine.com/content... , 1.75mm found at http://ultimachine.com/content/pla-175mm-silver-1lbhttp://ultimachine.com/content... . Their Silver PLA is a dream to print with. I printed it on Blue Tape, heat bed off, because I wanted the matte finish on the backside instead of a glossy finish. It blends in better that way.