Greg says Savonious blades work best when they can "spill" from one to the other through the axle, so I made a new blade design which allows the some overlap between the blades.  Another advantage of this is that it lets you print larger blades if you want.

The blades are self-symmetrical, and interchangeable. 

Like before, they're parametric:

• Blade Diameter
• Blade Height
• Blade Thickness