This is a modification of the stock mk3 filament sensor cover that adds M6x5.75mm threads. These threads allow the attachment of a PC4M6 connector to connect a Bowden tube. I left the same space within it for the short ptfe tube that inserts into the stock cover.
I am using this with ctilley79's modified Z tops that include M10 threads for a pass through PC4M10 -> https://www.thingiverse.com/thing:2825557 - I recommend it!!
....Print this in black as Prusa has stated there are some issues with the sensor with other colors.