The author remixed this model.
Modified the rotary file from https://www.printables.com/model/508762-neptune-3-pro-swiveling-filament-guide to include a tab to mount the filament sensor. I fell that mounting the the filament on the top of the frame is adding unnecessary weight and mass that can negatively effect prints.
https://www.printables.com/@ChrisEnders_798678 designed the original guide. It is an excellent combination of function and form. It does exactly what its supposed to do and it looks sexy doing it.
The added tab is designed with %100 infill. This allows you to drill the mounting hole to your specifications.