Prusa MK3 Bowden Screw-on Coupling for Extruder
thingiverse
Area51 made a great screw-on solution for the filament sensor and tiny ptfe tube at the top of the extruder assembly which I printed immediately. Then codiac2000 released a great reverse bowden solution which I needed for my filament box. I quickly mashed the two together for just the top piece. This allows a regular coupler to be screwed on to the extruder assembly and holds on to the small ptfe tube for easy removal. Use the sensor cover from Area51's design and you are good to go.
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