Amazon.com: iSANMATE Carbon Fiber Filament 3D Printer Filament, 1.75mm pla Filament 1.75mm Carbon Fiber Pla, High-Accuracy +/- 0.02 mm Carbon Black Pla Filament for Most 3D Printers, 1KG Spool : Industrial &
Amazon.com: Gizmo Dorks 1.75mm Carbon Fiber Fill Filament, 1 kg for 3D Printers : Industrial & Scientific
Amazon.com: Carbon Fiber Filled Nylon Filament 1.75mm, UltraPA-CF 3D Printer Filament, 1kg Spool 3D Printing Filament for 3D Printers, Carbon Black : Industrial & Scientific