Amazon.com: ERYONE Filament PLA 1.75 mm, Special 3D Printing PLA Filament 1.75 mm for 3D Printers and 3D Pens,+/-0.03mm 1kg (2.2lbs)/Spool, Dark Wood : Industrial & Scientific
Amazon.com: SUNLU 3D Pen Filament Refills, 10 Bright Rainbow Colors, Total 164 Feet (50 Meters), Each Color 16.4 Feet (5 Meters), PLA Filament 1.75mm for Most 3D Pens, Easy to Use, High