Print it in Ninjaflex at 70mm/s with the [Flexion Extruder]( https://www.flexionextruder.com "Flexible filament extruder") An octopus should be more squishy 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!