Extruder MK8 (for the CoreXY Frame v.1.0)

A direct compact extruder (prototype) for the CoreXY Frame v.1.0 (http://www.thingiverse.com/thing:1811983)
With a push button to change filament more easily. MK8 feed gear.
Step.motor Nema17 ( 45Ncm / 64oz.in );
Ball bearing V625ZZ;
Shaft ø5 x 28mm;
M3 brass insert (ø5x8mm) 4 pcs;
MK8 hobbed pulley (feed gear);
E3D Hotend V6 short-distance (1.75mm);
Spring ø7.5 x 8.1-15mm (Ikea PRESSA series) 2 pcs.;
17mm PTFE (tube 2x4mm) insert as filament guide.