A simple feather, very thin. Definitely has enough air resistance to fall slowly. Can be used in a multitude of projects

Originally designed and made for the Printables Make it Fly and Cat Toy contests (falls slowly and could be batted at by a cat who enjoys batting at feathers), but is generally multipurpose. It's a cool little thin feather.

Print Settings

Printer: 

Ultimaker 2+

Rafts:

No

Supports: 

No

Resolution:

0.06mm

The vanes of the feather are about 0.1mm so as long as your resolution can happily print them, it should be fine.

Your printer may print only the stalk if it considers the model too thin, so you may want to scale the model up from 1.2mm to ≥ 1.7mm to accomodate.

Infill: 

It's so thin I don't know if it will matter but 10% is what was used for this print I believe*

Filament: PLA

*Printed at my local library so filament brand is unknown, but any PLA should be fine.
And default infill there is 10% AFAIK.

Overall print weight should be ~1g.