TPU Flexible Filament: Articulated and Bendy Prints

TPU (Thermoplastic Polyurethane) is a flexible filament that bends without breaking. It opens up design possibilities that rigid materials simply cannot achieve — squeeze toys, flexible joints, and bendy figurines.

Understanding TPU

TPU is a rubber-like material that returns to its original shape after being compressed or stretched. Shore hardness ranges from 85A (very flexible) to 95A (semi-rigid). Most 3D printing TPU is 95A — firm enough to hold shape but flexible enough to bend.

Applications in Collectibles

Flexible figurines that survive drops from desks. Articulated toys with TPU joints for smooth, durable movement. Squeeze toys that bounce back to shape. Bendy characters that can be posed without breaking.

Printing with TPU

TPU requires a direct-drive extruder for reliable feeding. Print speeds are slower than PLA (20-30mm/s). Retraction settings need careful tuning to prevent stringing. Not every printer handles TPU well — our farm uses machines specifically configured for flexible materials.

TPU vs Other Flexibles

TPU offers the best balance of flexibility and printability. TPE is softer but harder to print. Ninjaflex is very flexible but requires specialized equipment. For most flexible collectible applications, standard 95A TPU delivers excellent results.

Creative Uses

At 3DCentral, we use TPU for specialized products — squishy ducks, flexible gnomes, and articulated figures with rubber-like joints. These pieces offer a tactile experience that rigid prints cannot match.