This is a variation of the piece I mixed originally for my MPSM after the new version bowden tube connector at the extruder failed. Days later the same thing happened to my MPDM. The difference is this same piece his nibs around the screw holes for the MPSM that must be removed for the MPMD.
This piece can be printed flat but better results in the threading can be had by printing it on edge with edge facing the extruder gear facing towards the bed, with full supports.
2018-19-04 - v1.2 Update - I increased the size of the filament hole and chamfered it inside the cap after I had an issue changing filament where the glob at the end got caught pulling it through. My first pass I printed flat with support Everywhere to maintain the threads, worked very nicely and the support in the hole can be twisted out counter-clockwise.