Modular 65mm Spindle Mount for ShapeOko2

I've designed a 65mm spindle mount to fit a Shapeoko2! I'm using this mount to hold a Chinese water-cooled 65mm AC spindle.

**You can learn more about this mount by watching the videos I made about it:**

* [Demonstration of the basic features of the mounting system.](https://www.youtube.com/watch?v=iYn1QCQ3Y6U)
* [Demonstration of the dust-collection features of the mounting system.](https://www.youtube.com/watch?v=YuTOi7dQXYw)

**The mount solves the following problems:**

+ Mount holds the spindle securely on the z-axis
+ Mounted spindle clears the motor mount at the top of the z-axis.
+ Mount fits onto the existing z carrage and does not add undue angular load to the z-axis.
+ Mount is 3D printable and requires only minimal hardware to install. (M5 bolts of varying lengths)
+ Mount is sized correctly to account for ABS shrinkage.
+ Mount holds a [laser diode](http://www.amazon.com/gp/product/B00BP42YMW/ref=as_li_tf_tl?ie=UTF8&camp=1789&creative=9325&cr