Kossel Mini Single and Dual Effectors (Kraken, J-Head. E3D-v6, UBIS)

I've designed a few effectors for my Kossel Minimax (a Kossel Mini derrivative) to hold various hotends.

Included is effectors that support:

* Single & dual [J-Head](http://reprap.org/wiki/J_Head_Nozzle)
* Single & dual [E3D-V6](http://e3d-online.com/E3D-v6) and Lite6
* [E3D Kraken](http://e3d-online.com/The-Kraken)
* [Printrbot Ubis](https://printrbot.com/shop/1-75mm-ubis-hot-end/)


The Ubis, E3D, and J-Head hotends have a standard Kossel Mini effector radius of 20mm.

The Dua