Ariens GT Fan Blade

This fan replaces the stock fan for Ariens GT lawn tractors. The stock design requires removal of the drive shaft and breaks easily. This design does not require removal of the drive shaft, should be less likely to break given the toroid shape, and is very cheap to replace (just the cost of printing).

There are two versions. The first version uses 4 aligning pins and is 100% 3d printed. The second version uses 2 aligning pins and 2 threaded inserts (M3 size, see photograph).

The fan is designed to be too loose on the driveshaft. You will need to wrap 2-4 layers of take (I used electrical tape), then attach the fan at that location. This is because the PLA and the steel shaft have no grip otherwise. 

You also need to glue the fan together. Even with the version with m3 inserts, the glue is necessary to keep the fan from being destroyed by the rotational forces.  I used superglue at the recommended bonding temperature with good success.

**This fan may destroy itself catastrophically even if printed well under normal use. The fan will be rotating at high RPM and under harsh environments. Make sure that any catastrophic  failure will not cause damage to people or equipment. Personally, I have experienced multiple incidents like this during design and testing and the result was just pieces of plastic in the yard, but your experience may vary.