Flexible Filament for 3D Printing: Materials Guide Flexible filaments are a popular material used in 3D printing. The most popular flexible filament is TPU or thermoplastic polyurethane.
PLA vs ABS- Which is Better for 3D Printing PLA vs ABS? Which should you choose? ABS is lighter, more flexible, and stiffer. It has a higher elongation at breaking than PLA.