Low Friction & Better Overhang Propeller (TPU-friendly) for Wind-up Boat

The original propeller had a 20-deg overhang, which made it difficult to print without support and brim, or if one wants to print with TPU. 

The original shaft also has too much contact area which increases friction.

I wanted to print this propeller and its shaft in TPU so that it will never break and never hurt my fingers, but the original overhang was just impossible for TPU. So I designed this new propeller to be printed without support.

The original propeller had a 20-deg overhang, which made it difficult to print without support, or with TPU.