Direct Mk7 extruder

A compact extruder that I remixed from various sources, but mainly from the excellent design in http://www.thingiverse.com/thing:292437, its designed for a MK7 pulley, its easy to clean and tailored to fit snuggly to my E3D mount http://www.thingiverse.com/thing:625337.

You will also need a 625 bearing with a M5x20 hex screw and nut as a rod, a M3x40 and M3 nut and spring for the adjusting screw, some M3 washers (two for the swivel for right spacing and smooth rotation) and M3x10 screws to fi