TPU Filament Filaflex 70A, Flexible Filament for 3D Printing
Amazon.com: YXPOLYER TPU Filament 1.75 mm Flexible Soft 95A TPU 3D Printer Filament, 800g Spool (1.76 lbs) Elastic 3D Printing Filament, Hardness and Good Layer bonding Performance, Fit Most FDM Printer(Black) :
TPU Flexible Filament 1.75MM, 1kg, High Resilience 3d Filament for Most FDM Printer, Fast Shipping - AliExpress