Sunhokey compact carriage for opto autobed leveling E3D V6

Inspired by:

http://www.thingiverse.com/thing:742947
http://www.thingiverse.com/thing:714939
http://build3dparts.com/wp/?page_id=455

This system is easy to calibrate and very precise. I printed with layer height = 0,2 mm, no support. Clean all the pieces after the print, to ensure a perfect performance of the fan duct, cover its surface with ABS slurry.
You will need a 40 mm M4 screw to lock the extruder (see http://www.thingiverse.com/thing:742947)

Firmware modification Configuratio