Troublemaker 3D printer (Ultimaker derivative)

Troublemaker is a derivative from the highly popular open-source 3D printer [Ultimaker Original](https://www.ultimaker.com/pages/our-printers/ultimaker-original) by active individuals of [Drustvo Elektronikov Slovenije](http://drustvo.elektronikov.si/?cat=38) (hobby electronics society) designed for the members group 3D printer build lead by myself. With about 80 members very interested in having a 3D printer, we have incorporated modifications and improvements into a derivative design nicknamed Troublemaker.
The main differences from Ultimaker original are:
- Improved enclosure design, allowing for easy heated chamber upgrade. The enclosure has been enlarged to house the bowden above print head, so only flat plexy pieces are needed to enclose it.
- Added support to mount two extruders and reels for dual-print configuration.
- Can support almost any printhead with a 3D printer mount, the main choice is [E3D metal-only hotend](http://e3d-online.com/E3D-HotEnds), which performs v