M2-Extruder tighened up throat for Flexible materials

Modified from http://www.thingiverse.com/thing:433292

I reverse engineered and dramatically closed up the filament path to be able to print with ninja flex and filaflex. I slow down from stock PLA speed by 40%. Uses the stock extrude gear. V3B 24V hotend.

Made the feed tube hole 3/16" to hold the tube free standing. Filament path and bearing clearance closed up (keeps soft materials from wading up).
Added a loop to outside to zip tie your wires.
Added 2 holes for screws to added