Ender 3 top rail filament guide

Remixed heavily based on Tool Holder (freestanding). It is used in combination with one of the rolling guides mounted on the Bowden extruder on the Ender 3 series. it keeps the filament close to the frame so the Ender 3 can fit into the medium size Creality Enclosure, as shown in photos.

Print in any material you like, it doesn't need to be strong or stiff. But I found it is too loose in the rail. so either scale it up a bit so it fits tight, or what I did was glue it in with hot melt glue. Works for me!