Trinus E3Dv6 (Bowden) Precision Piezo

This is the first public version of my Trinus print head using an E3Dv6 (Bowden) with integrated [Precision Piezo](http://www.precisionpiezo.co.uk/ "Precision Piezo") Z probe.

The design (style) has been based on the Ormerod E3D Precision piezo by Dignitate but due to the strange layout and offset of the Trinus print head. I started this design from scratch.

There are four parts to the design
* Back plate - designed to sit in the standard Trinus metal plate
* Hotend and Universal PCB mount - two separate pieces
Hotend mount - the E3Dv6 universal heatsink slides into the slot beneath the piezo dome
Universal PCB mount - this slides into the same slot as the universal heatsink and provides a solid 360 degree support for the heatsink. The PCB mount is held in place by two M3 screws
* 27mm piezo mount - to support the piezo disc when sandwiched between the back plate and hotend mount

I used M3 button head hardware and I have tapped all the holes in the Hotend