Spitfire Propeller designed with Autocad 3D 1:4 model
Root hub to fit into spinner: 3.4cm diameter circle. From Root to tip = 375 mm or 14.76 inches
Comes in 5 parts, glued together using locttite 406 superglue for plastics
Estimated 1.75mm filament needed for 1 blade (1:4 scale model) = Between 15meters to 25meters (49ft to 82ft)
Print with PLA to avoid wrapping and to produce relatively sharp trailing edge of the blade.
You can scale accordingly. Eg, a 1:8 model just divide full scale by 2. Recommended print settings (tested as per picture)
-Vertical wall: 2 shells Infill honeycomb/rectilinear 5% -Bottom and Top solid layers: 3 -Printspeed keep it generally 50mm/s throughout for smooth and sharp print especially at the trailing edge of the blade