Top Rail Mounted Reverse Bowden Holder (M10)

I wanted to have a little reverse Bowden setup to keep my filament enclosed on its way to the extruder, so I mixed these two Things together in Tinkercad. On one side (the one marked FITTING) is the threads for a PC4-M10 coupling, the other side is the filament entry. The guide attaches to the top rail of the printer (Ender 3 or similar) with M5x40 bolts affixing the top extrusion to one of the uprights.

Body of the filament guide, but with the reverse Bowden mount instead of the filament guide wheel