If you own an Ender 3 or Ender 3 Pro you've probably noticed that the filament goes extremely close to the Z Axis threaded bar. Sometimes even getting jagged or jammed in it.
This design is quite simply a sturdy, quality filament guide to keep the filament away from the Z axis bar, and feeding as it should do - with the curved/chamfered filament guide hole design, it allows for the filament to feed in (and out), smoothly and efficiently.
Print this one with supports, cura zig-zag supports work well. The only part that needs support is the loop and hole where the filament feeds through. Please see the photos for where to install it, and note, it installs on a slight angle to allow for it to mount flush away from the little metal lip around the z axis bar at the bottom.
Feel free to like, and post a make / install if you find it helpful! This was to replace the pre-existing filament guide that is currently out there, as the hook/filament guide kept snapping as it was very fragile. The fillets in my design allow for strength, durability and stability.