Flexible Ninja

Print it in Ninjaflex at 70mm/s with the [Flexion Extruder](https://www.flexionextruder.com "Flexible filament extruder").  A ninja should be more flexible than 85A durometer.  The Flexion extruder can print materials as soft as 60A.  Send an email to NinjaTek asking them to release a softer filament!