Easy and quick to print (no brim, support is very minimal) (+/- 35 Min), the guide can be fixed to the original printer's filament roll support. I used two M6X12 countersunk screws, with washer and nut on the rear side of the roll support bracket to attach the guide.
On the pictures, it is my first version, with a 4mm opening on the side, but I found out that when printing with stiffer filament (like fluorescent), it could “escape” the guide, so the files are an adapted version with a 1.9mm opening, but not tested yet.
(I started sketching and printing from zero knowledge about one month ago, so be forgiving if my file is not up to the state of art of the printing community ;) )
The author marked this model as their own original creation.