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https://www.thingiverse.com/thing:2371851
Makergear M2 V4 hotend Extruder tightened up throat for Flexible materials by cas000176 is licensed under the Creative Commons - Attribution - Share Alike license.
http://creativecommons.org/licenses/by-sa/3.0/

# Summary

I have upgraded my Makergear M2 from the 3Vb, to the V4 hotend and had to recreate this extruder mod for soft materials for my M2. Just installed it this past weekend and I am conducting testing at this time. So far and works good I will post pictures later. I made mine from PETG,

S3D factory file included with supports and PETG profile,

Settings that I use when printing ninjaflex.

I use the following with a M2 Std. .35mm nozzle on painter tape for ninjaflex.

3mm extrusion retractions
2400mm/min retraction speed
.20mm Wipe
Extruder 215 Deg. C
Bed off
Layer 1 fan off. Other 100%
Default print speed 2000mm/min

Loading the Extruder must be done slower that PLA or ABS. I turn down my feed on the extruder to 200mm/min for loading. Also helps to do loading 10mm at a time till all the old filament is expelled.

Update 6/9/17
Testing completed with PLA, ABS, PETG, and Ninjaflex. Shoved everything though the hot end like a boss 

# Print Settings

Printer Brand: MakerGear
Printer: MakerGear M2
Rafts: No
Supports: Yes
Resolution: .2
Infill: 80% Honeycomb

Notes: 
S3D factory file for PETG