Extruder Filament Guide for the MK8 Bowden Extruder Upgrade Kit on the Ender 3

I wanted to have a filament guide for my bowden extruder on my Ender 3. The ones I found could not satisfy my needs or simply did not fit all the holes correctly (filament, axis, screws). I designed this filament guide capable of holding a ball bearing or pulley to feed the filament into the extruder without wearing out its own material. It has a nice and snuggly fit without the need of dismantling the z-axis. Only the two screws connecting the carriage to the threaded rod need to be unscrewed a