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Hi warham. There's already a version for two push fit connectors, one on each side. Just have a look at the different extruder bodies. Furthermore there are a lot of remixes out there optimized for flexible filaments, e.g. http://www.thingiverse.com/thing:1728411, http://www.thingiverse.com/thing:1676931 or http://www.thingiverse.com/thing:1084109

Semi flexible TPE bowden extruder modification
by Wolraad
Extruder for flexible filament
by kona
Compact Bowden Extruder for Flex filament
by Billie