File Location
I understand that Prusa has a policy of making their parts open for users. I have a MK4S and recently I broke the filament "standoff" (not certain what the correct name is but added a picture) and i would like to replicate the part. Where do I go to find the file or are they not available? 
RE: File Location
Is this any help?
https://www.printables.com/model/1176804-longer-prusa-filament-guide/files
Or this?
https://www.printables.com/model/791771-prusa-filament-guide-step-file
Maybe this
https://www.printables.com/model/480085-remixed-prusa-filament-guide-bigger-ptfe-for-mk3s
Old School
https://www.printables.com/model/447484-prusa-mk3-filament-guide
I hope one of them works for you! ~regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
RE: File Location
Just to plug my own design, here is another option (it isn't designed to use the large diameter PETG tubing that Prusa's more recent design does).
https://www.printables.com/model/60494-mk3-filament-guide
See my (limited) designs on:
Printables - https://www.printables.com/@Sembazuru
Thingiverse - https://www.thingiverse.com/Sembazuru/designs