Ender 3 filament guide using 6x17x6mm bearings.

prusaprinters

requires two longer M screws to replace the two already on the top securing the top horizontal extrusion (I used 45mm long). Doesn't need to be too strong as not supporting any weight other than itself although might want to be printed in petg if used in a chamber. Might require some sanding or use of a vice/clamp to fit together if printer struggles with tolerances.