1.75MM Filament Filter Ball

I created this to be used with my Robo 3D R1 -

I had the twist-in-hood filament filter but when the Z height was very high the filament would not feed as nicely as it should.

You can use this above or below the hood.

I am using it above as I have a filament spool holder mounted to the top of the Robo 3D hood and find the ball keeps it from catching and rubbing on the parts mounted to the hood.