I remix an original Filament Dust filter for MK3 because the cover is not enough align with the IR filament sensor pcb for MK3S+
I downloaded filament sensor cover on the Prusa printed part website (https://www.prusaprinters.org/fr/prints/57217-i3-mk3s-printable-parts/files#preview) and add the screw on it with Tinkercad.
I mounted it on my brand new Prusa MK3S+ and it's OK !
You have just to put foam into the cap and screw it on the cover and say: Goodbye dust !
The author hasn't provided the model origin yet.