My design of a top mounted roll holder and a feeder-guide that travels with the extruder.
The small plate in the feeder STL needs to be glued (with 3 seconds glue in my case) in the space made for it and it needs a small hole to allow the bolt from the Z-axis wheel through, so ia bit of extra work is needed. I mounted it already and did not have the time to take it out, measure and adjust the drawing + STL.
Use a long M4 bolt , coming from the back, to hold the 2 wheels.
The curved side plates can be mounted with 4x M4 screws + nuts.
No real supports needed, except for the wheels.