E3D v6 hotend mount for Creality CR7, CR8, CR10. Modular Snap-In design

See the latest 2018 design here
https://www.thingiverse.com/thing:2920346
This replaces the design below.


##### 2016/2017 design
The design considerations were:
- To be able to access and remove the Hotend quickly
- Modular, Snap-in design
- Parts like Fan mount, Proximity are all optional
- The E3D must fit tightly
- Support for larger Proximity sensor with sensing range (8mm)
- To be able to attach very popular Cable Chain

`Important - Print resolution 0.2mm or better`