SquareBOT extruder MK8

Archive model. Not recommended for repetition.
New SB extruder: https://www.thingiverse.com/thing:2658691
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The extruder for the SquareBOT 3D printer (http://www.thingiverse.com/thing:1731160) with a push knob for easy filament change, MK8 feed gear and universal SB mount.
Fits only to double precision guides http://www.thingiverse.com/thing:1760702
Step.motor Nema17 ( 45Ncm / 64oz.in );
Ball bearings V625ZZ, 695ZZ;
Fan 40x40x20(10);
E3D Hotend V6;
10mm PTFE (tube 2x4mm) insert as