Maker Select Filament Guides (slotted)

I printed the thin guide and it helped a lot with filament consistency during prints, but because it was so thin it would drag across the rail as the extruder went left/right. I ended up using the original thick one.

I really liked this mod, as it's been extremely helpful, but I try to avoid removing my filament from the extruder as much as possible, so I added a 2mm slot in the bearings (at an angle) so the filament can be inserted more easily.