Skeleton 3D : Evolved

A makeover of the Skeleton 3D by "Catastrophe" with:
* **A new Z axis carriage**: more robust and less Z wobble.
* **A E3D Bowden extruder** (instead of the original Aluhotend): better print quality with higher printing speeds.
* **Screen and attachement for the electronics**: ease of transportation and usage. Also adds rigidity to the frame.
* **Part cooling fan & fan duct**: better print quality.

All parts are included in the **S3D_Evolved.zip** file.

These new parts are fully compatible with the original Skeleton 3D.

I made an article on my website to describe this printer, with build instructions, wiring and source files: http://charleslabs.fr/en/project-S3D+Evolved+-+compact+3D+printer

Video: https://youtu.be/Xid42I-h5R0