1.75MM Filament Filter Ball

thingiverse

I designed this filter specifically for my Robo 3D R1 - It was created to replace the twist-in-hood filament filter, which had a problem feeding properly when the Z height was set too high. This new filter can be used either above or below the hood, depending on your setup. I've found it works best when installed above the hood, as my filament spool holder is mounted to the top of the Robo 3D hood and the ball serves as a buffer, preventing the filter from catching and rubbing against the parts attached to the hood.