E3D v6 hot-end mod for Da Vinci 1.0

This is a remix of [thing:608560](http://www.thingiverse.com/thing:608560), which works quite well but in my opinnion it could do with a more sturdy assembly, for improved stability of the hot-end and the carriage itself.

I've modified the lower part and the spacer (which comes from the original v2 design). The upper part and the drilling template are the same models that can be found in the original v1 mod.

**Update (20150512)**: I've created a custom layer cooling fan duct to go with th