Amazon.com: TTYT3D 1.75mm ABS 3D Pen Printer Filament Refills, 20 Colors, Each Color 3.5m, Total 70m ABS Sample Pack, Support for FDM 3D Printer 3D Pen, Not Suppor for 3Doodler Pen :
Amazon.com: OVERTURE ABS Filament 1.75mm, ABS 1kg Spool (2.2lbs),3D Printer Filament,Dimensional Accuracy +/- 0.03 mm, Fit Most FDM Printer (Black 1-Pack) : Industrial & Scientific