Adjustable bowden extruder push fit

This is bowden extruder which can adjust tension of spring easily with M3 allen wrench.
It is for MK7 and MK8 drive gear and 688ZZ(8x16x5) bearing.

**edit**
I have now put 1Km through the extruder with no issues
** **

Remixed to use a standard push fit with a 1/8th(10mm) thread and now M6

Filament is guided all the way through inside extruder, designed to use pfte all the way to the drive gear.

It is 17mm thick with a 2mm recess for the motor and designed to mount on the wall, dep