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

thingiverse

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 and put back in place after assembling. This filament guide is designed to work with [this MK8 Bowden Extruder Upgrade Kit](https://www.amazon.de/gp/product/B07NWCTTN6) and **probably won't fit on the factory bouden extruder**. Furthermore the distances are optimized for holding a pulley or ball bearing with the following dimensions: - 3 mm (inner) - 12 mm (outer) - 4 mm (height) I used this [V623ZZ pulley](https://www.amazon.de/gp/product/B07D28QHMG) but any bearing with the matching dimensions should fit. You need an additional M3*16 screw and a matching M3 nut to fix the pulley in place. The filament guide has the following dimensions: - 23 mm (height) - 30 mm (width) - 29 mm (length)