Minimal Gap 1.75mm Filament Feeder

I have been printing in 1.75mm filament exclusively for over a year on my Ultimaker 2 ex. I wanted to update and share this print to include the modifications to the components I currently use. The filament is pushed through the extruder by a feeder which hangs above the printer from a spring. This arrangement was desired to reduce the length of the Bowden tube to a minimum and to keep it straight. I desired a suitable way to print in TPU. I am quite pleased with the results in ABS and with