The NinjaFlex TPE filament is a 0.75-kg spool of 3-mm diameter water-colored filament for use with fused-filament 3D printers (sold separately). NinjaFlex is made of a thermoplastic elastomer (TPE) that creates strong, flexible printed parts with excellent abrasion resistance. The material bonds well to itself, minimizing the chance of printed layers separating when flexed or stretched. The print temperature ranges from 210 to 225 degrees C (410 to 437 degrees F).

Fenner Drives manufactures belting, bushings, and tensioners for industrial applications, as well as NinjaFlex 3D printer filament. The company, founded in 1911, is headquartered in Manheim, PA.