filament anti-wet cover, designed for MMU2 owners (fits into plastic molding of filament holder)
I recomend Noozle 0.6 and the diametr of hole in the top of nose Is ready for bossard threaded inserts BN1052 M5 (just push into the hole by soldering arbor). With that you can use same fitting and teflon tube as you know from MMU2 unit.
The author hasn't provided the model origin yet.