Amazon.com: Silk Copper PLA Filament 1.75 mm 500g 3D Printer Filament Shiny Metallic Copper 3D Printing PLA Material 0.5KG CC3D : Industrial & Scientific
ColorFabb copperFill Metal Filament - 1.75mm (0.75kg) | MatterHackers
GIANTARM 3D Printer PLA Filament, Shiny Silk Copper Toughness Enhanced Filament with 1.75mm Dimensional Accuracy +/-0.03mm, 1080 Feet per Roll, Vacuum Packaging, for Most 3D FDM Printer - Walmart.com