I know how hard it is to 3D print with Flexible filament. I have tried out couple of filaments available in local market but they do not perform task as required. Extruder available online are very expensive for the task they perform.
So I decided to build 3D printer extruder myself.
It works with almost all type of flexible filaments, even with TPU and TPE filaments.
Check out video for printing in action.
Attached is STL and Sketchup Files of design.
Updated more images of Extruder.