Direct Drive (Gearless) Extruder

I've been using this direct drive (gearless) extruder with 3 mm ABS for about 6 months now and lately with PLA . I took the original Sells Mendel extruder and split it into two in order to use a spring to apply tension on the idler. The advantage of this extruder over the newer MK7 designs that use less plastic is that you can print the whole extruder except for the hobbed bolt or MK7 gear.

I made two versions: One uses the MK7 pinch wheel and the other uses an M8 hobbled bolt that's been cu