A quick and dirty remix of Matthew's Minimal PTFE Tube Guide which can be mounted on one of the z-axis cover screws on each side.
This is compatible with a Bondtech extruder. The original one does not fit in the upmost z-positions since the Bondtech extruder needs some space.
I added the f3d in case someone wants to improve my quick and dirty design.
The author remixed this model.